21103013020231 has 4 divisors (see below), whose sum is σ = 21104552388600. Its totient is φ = 21101473651864.

The previous prime is 21103013020211. The next prime is 21103013020247. The reversal of 21103013020231 is 13202031030112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21103013020231 - 2²³ = 21103004631623 is a prime.

It is a super-2 number, since 2×21103013020231² (a number of 27 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 = 21103013020199 and 21103013020208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103013020211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769663621 + ... + 769691038.

It is an arithmetic number, because the mean of its divisors is an integer number (5276138097150).

Almost surely, 2^{21103013020231} is an apocalyptic number.

21103013020231 is a deficient number, since it is larger than the sum of its proper divisors (1539368369).

21103013020231 is a wasteful number, since it uses less digits than its factorization.

21103013020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539368368.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21103013020231 its reverse (13202031030112), we get a palindrome (34305044050343).

The spelling of 21103013020231 in words is "twenty-one trillion, one hundred three billion, thirteen million, twenty thousand, two hundred thirty-one".