21321032610 has 16 divisors (see below), whose sum is σ = 51170478336. Its totient is φ = 5685608688.

The previous prime is 21321032597. The next prime is 21321032627. The reversal of 21321032610 is 1623012312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355350514 + ... + 355350573.

It is an arithmetic number, because the mean of its divisors is an integer number (3198154896).

Almost surely, 2^21321032610 is an apocalyptic number.

21321032610 is an abundant number, since it is smaller than the sum of its proper divisors (29849445726).

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

21321032610 is a wasteful number, since it uses less digits than its factorization.

21321032610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710701097.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21321032610 its reverse (1623012312), we get a palindrome (22944044922).

The spelling of 21321032610 in words is "twenty-one billion, three hundred twenty-one million, thirty-two thousand, six hundred ten".