21203012031 has 8 divisors (see below), whose sum is σ = 28271877120. Its totient is φ = 14134744152.

The previous prime is 21203012027. The next prime is 21203012059. The reversal of 21203012031 is 13021030212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21203012031 - 2² = 21203012027 is a prime.

It is a super-2 number, since 2×21203012031² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21203012031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203012071) 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, 58585 + ... + 214098.

It is an arithmetic number, because the mean of its divisors is an integer number (3533984640).

Almost surely, 2^21203012031 is an apocalyptic number.

21203012031 is a deficient number, since it is larger than the sum of its proper divisors (7068865089).

21203012031 is a wasteful number, since it uses less digits than its factorization.

21203012031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298605.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21203012031 its reverse (13021030212), we get a palindrome (34224042243).

The spelling of 21203012031 in words is "twenty-one billion, two hundred three million, twelve thousand, thirty-one".