21320415502 has 16 divisors (see below), whose sum is σ = 32849105472. Its totient is φ = 10370786400.

The previous prime is 21320415499. The next prime is 21320415511. The reversal of 21320415502 is 20551402312.

It is a congruent number.

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, 853563 + ... + 878185.

It is an arithmetic number, because the mean of its divisors is an integer number (2053069092).

Almost surely, 2^21320415502 is an apocalyptic number.

21320415502 is a deficient number, since it is larger than the sum of its proper divisors (11528689970).

21320415502 is a wasteful number, since it uses less digits than its factorization.

21320415502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36363.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21320415502 its reverse (20551402312), we get a palindrome (41871817814).

The spelling of 21320415502 in words is "twenty-one billion, three hundred twenty million, four hundred fifteen thousand, five hundred two".