21210121032 has 16 divisors (see below), whose sum is σ = 53025302640. Its totient is φ = 7070040336.

The previous prime is 21210121013. The next prime is 21210121067. The reversal of 21210121032 is 23012101212.

It is an alternating number because its digits alternate between even and odd.

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, 441877498 + ... + 441877545.

It is an arithmetic number, because the mean of its divisors is an integer number (3314081415).

Almost surely, 2^21210121032 is an apocalyptic number.

It is an amenable number.

21210121032 is an abundant number, since it is smaller than the sum of its proper divisors (31815181608).

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

21210121032 is a wasteful number, since it uses less digits than its factorization.

21210121032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883755052 (or 883755048 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210121032 its reverse (23012101212), we get a palindrome (44222222244).

The spelling of 21210121032 in words is "twenty-one billion, two hundred ten million, one hundred twenty-one thousand, thirty-two".