21102303031 has 4 divisors (see below), whose sum is σ = 22343614992. Its totient is φ = 19860991072.

The previous prime is 21102303011. The next prime is 21102303071. The reversal of 21102303031 is 13030320112.

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 21102303031 - 2⁵ = 21102302999 is a prime.

It is a super-2 number, since 2×21102303031² (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 = 21102302996 and 21102303014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102303011) 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, 620655955 + ... + 620655988.

It is an arithmetic number, because the mean of its divisors is an integer number (5585903748).

Almost surely, 2^21102303031 is an apocalyptic number.

21102303031 is a deficient number, since it is larger than the sum of its proper divisors (1241311961).

21102303031 is a wasteful number, since it uses less digits than its factorization.

21102303031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241311960.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21102303031 its reverse (13030320112), we get a palindrome (34132623143).

The spelling of 21102303031 in words is "twenty-one billion, one hundred two million, three hundred three thousand, thirty-one".