21210221002002 has 64 divisors (see below), whose sum is σ = 44749881717120. Its totient is φ = 6683455770624.

The previous prime is 21210221001979. The next prime is 21210221002043. The reversal of 21210221002002 is 20020012201212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174749328 + ... + 174870660.

It is an arithmetic number, because the mean of its divisors is an integer number (699216901830).

Almost surely, 2^{21210221002002} is an apocalyptic number.

21210221002002 is an abundant number, since it is smaller than the sum of its proper divisors (23539660715118).

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

21210221002002 is a wasteful number, since it uses less digits than its factorization.

21210221002002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124667.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21210221002002 its reverse (20020012201212), we get a palindrome (41230233203214).

The spelling of 21210221002002 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, two thousand, two".