21103044231 has 16 divisors (see below), whose sum is σ = 29818455264. Its totient is φ = 13229604864.

The previous prime is 21103044223. The next prime is 21103044251. The reversal of 21103044231 is 13244030112.

It is not a de Polignac number, because 21103044231 - 2³ = 21103044223 is a prime.

It is a super-2 number, since 2×21103044231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21103044198 and 21103044207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103044251) 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, 120636 + ... + 238241.

It is an arithmetic number, because the mean of its divisors is an integer number (1863653454).

Almost surely, 2^21103044231 is an apocalyptic number.

21103044231 is a deficient number, since it is larger than the sum of its proper divisors (8715411033).

21103044231 is a wasteful number, since it uses less digits than its factorization.

21103044231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360050.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21103044231 its reverse (13244030112), we get a palindrome (34347074343).

The spelling of 21103044231 in words is "twenty-one billion, one hundred three million, forty-four thousand, two hundred thirty-one".