Search a number
-
+
20102111021 = 235851149377
BaseRepresentation
bin10010101110001011…
…011101111100101101
31220212221200001020102
4102232023131330231
5312132120023041
613122414000445
71311102060446
oct225613357455
956787601212
1020102111021
1185861325a3
123a901a6125
131b848aa265
14d89aa62cd
157c9bdb09b
hex4ae2ddf2d

20102111021 has 8 divisors (see below), whose sum is σ = 20979841344. Its totient is φ = 19224691200.

The previous prime is 20102110961. The next prime is 20102111039. The reversal of 20102111021 is 12011120102.

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 20102111021 - 26 = 20102110957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20102110993 and 20102111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102113021) 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, 59885 + ... + 209261.

It is an arithmetic number, because the mean of its divisors is an integer number (2622480168).

Almost surely, 220102111021 is an apocalyptic number.

It is an amenable number.

20102111021 is a deficient number, since it is larger than the sum of its proper divisors (877730323).

20102111021 is a wasteful number, since it uses less digits than its factorization.

20102111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155251.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20102111021 its reverse (12011120102), we get a palindrome (32113231123).

The spelling of 20102111021 in words is "twenty billion, one hundred two million, one hundred eleven thousand, twenty-one".

Divisors: 1 23 5851 134573 149377 3435671 874004827 20102111021