Search a number
-
+
21212021011 = 55759963577
BaseRepresentation
bin10011110000010101…
…011100000100010011
32000202022011022111211
4103300111130010103
5321420234133021
613424503120551
71350440126566
oct236025340423
960668138454
1021212021011
118aa56a6385
12413ba43157
13200081a82c
1410532644dd
1584237d3e1
hex4f055c113

21212021011 has 8 divisors (see below), whose sum is σ = 21285914400. Its totient is φ = 21138257088.

The previous prime is 21212020987. The next prime is 21212021023. The reversal of 21212021011 is 11012021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212021011 - 25 = 21212020979 is a prime.

It is a super-2 number, since 2×212120210112 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212020982 and 21212021000.

It is not an unprimeable number, because it can be changed into a prime (21212021041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301855 + ... + 365431.

It is an arithmetic number, because the mean of its divisors is an integer number (2660739300).

Almost surely, 221212021011 is an apocalyptic number.

21212021011 is a deficient number, since it is larger than the sum of its proper divisors (73893389).

21212021011 is an equidigital number, since it uses as much as digits as its factorization.

21212021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64733.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212021011 its reverse (11012021212), we get a palindrome (32224042223).

The spelling of 21212021011 in words is "twenty-one billion, two hundred twelve million, twenty-one thousand, eleven".

Divisors: 1 557 599 63577 333643 35412389 38082623 21212021011