21502010202 has 16 divisors (see below), whose sum is σ = 43006162080. Its totient is φ = 7166979792.

The previous prime is 21502010197. The next prime is 21502010237. The reversal of 21502010202 is 20201020512.

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, 60648 + ... + 216060.

It is an arithmetic number, because the mean of its divisors is an integer number (2687885130).

Almost surely, 2^21502010202 is an apocalyptic number.

21502010202 is an abundant number, since it is smaller than the sum of its proper divisors (21504151878).

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

21502010202 is a wasteful number, since it uses less digits than its factorization.

21502010202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178477.

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21502010202 its reverse (20201020512), we get a palindrome (41703030714).

The spelling of 21502010202 in words is "twenty-one billion, five hundred two million, ten thousand, two hundred two".