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21220121002012 = 22307144715677621
BaseRepresentation
bin1001101001100101100011…
…10001100100000000011100
32210010121211201101102102221
410310302301301210000130
510240132301434031022
6113044220005355124
74320050244305242
oct464626161440034
983117751342387
1021220121002012
116841448109809
122468727708aa4
13bac08336139a
145350b8b68792
1526beb623ecc7
hex134cb1c6401c

21220121002012 has 48 divisors (see below), whose sum is σ = 37310607566848. Its totient is φ = 10560061419840.

The previous prime is 21220121002009. The next prime is 21220121002019. The reversal of 21220121002012 is 21020012102212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220121002019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2784423562 + ... + 2784431182.

Almost surely, 221220121002012 is an apocalyptic number.

It is an amenable number.

21220121002012 is a deficient number, since it is larger than the sum of its proper divisors (16090486564836).

21220121002012 is a wasteful number, since it uses less digits than its factorization.

21220121002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10946 (or 10944 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220121002012 its reverse (21020012102212), we get a palindrome (42240133104224).

The spelling of 21220121002012 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, twelve".

Divisors: 1 2 4 307 614 1228 1447 1567 2894 3134 5788 6268 7621 15242 30484 444229 481069 888458 962138 1776916 1924276 2267449 2339647 4534898 4679294 9069796 9358588 11027587 11942107 22055174 23884214 44110348 47768428 696106843 1392213686 2784427372 3385469209 3666226849 6770938418 7332453698 13541876836 14664907396 17280228829 34560457658 69120915316 5305030250503 10610060501006 21220121002012