21520225102 has 16 divisors (see below), whose sum is σ = 33289833600. Its totient is φ = 10428751480.

The previous prime is 21520225091. The next prime is 21520225117. The reversal of 21520225102 is 20152202512.

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, 1275952 + ... + 1292707.

It is an arithmetic number, because the mean of its divisors is an integer number (2080614600).

Almost surely, 2^21520225102 is an apocalyptic number.

21520225102 is a deficient number, since it is larger than the sum of its proper divisors (11769608498).

21520225102 is a wasteful number, since it uses less digits than its factorization.

21520225102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568791.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21520225102 its reverse (20152202512), we get a palindrome (41672427614).

The spelling of 21520225102 in words is "twenty-one billion, five hundred twenty million, two hundred twenty-five thousand, one hundred two".