21203031031 has 32 divisors (see below), whose sum is σ = 26679542400. Its totient is φ = 16743944448.

The previous prime is 21203031007. The next prime is 21203031049. The reversal of 21203031031 is 13013030212.

It is a de Polignac number, because none of the positive numbers 2^k-21203031031 is a prime.

It is a super-2 number, since 2×21203031031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203030996 and 21203031014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203031061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2479395 + ... + 2487931.

It is an arithmetic number, because the mean of its divisors is an integer number (833735700).

Almost surely, 2^21203031031 is an apocalyptic number.

21203031031 is a deficient number, since it is larger than the sum of its proper divisors (5476511369).

21203031031 is an equidigital number, since it uses as much as digits as its factorization.

21203031031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9128 (or 9114 counting only the distinct ones).

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

Adding to 21203031031 its reverse (13013030212), we get a palindrome (34216061243).

The spelling of 21203031031 in words is "twenty-one billion, two hundred three million, thirty-one thousand, thirty-one".