21031213032 has 64 divisors (see below), whose sum is σ = 58998513600. Its totient is φ = 6940987200.

The previous prime is 21031213003. The next prime is 21031213067. The reversal of 21031213032 is 23031213012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21031212996 and 21031213014.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460198 + ... + 503829.

It is an arithmetic number, because the mean of its divisors is an integer number (921851775).

Almost surely, 2^21031213032 is an apocalyptic number.

It is an amenable number.

21031213032 is an abundant number, since it is smaller than the sum of its proper divisors (37967300568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031213032 is a wasteful number, since it uses less digits than its factorization.

21031213032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964143 (or 964133 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21031213032 its reverse (23031213012), we get a palindrome (44062426044).

The spelling of 21031213032 in words is "twenty-one billion, thirty-one million, two hundred thirteen thousand, thirty-two".