21231203012 has 12 divisors (see below), whose sum is σ = 37438229136. Its totient is φ = 10534566120.

The previous prime is 21231202987. The next prime is 21231203023. The reversal of 21231203012 is 21030213212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20258258 + ... + 20259305.

It is an arithmetic number, because the mean of its divisors is an integer number (3119852428).

Almost surely, 2^21231203012 is an apocalyptic number.

It is an amenable number.

21231203012 is a deficient number, since it is larger than the sum of its proper divisors (16207026124).

21231203012 is a wasteful number, since it uses less digits than its factorization.

21231203012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40517698 (or 40517696 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21231203012 its reverse (21030213212), we get a palindrome (42261416224).

The spelling of 21231203012 in words is "twenty-one billion, two hundred thirty-one million, two hundred three thousand, twelve".