21001012021202 has 32 divisors (see below), whose sum is σ = 34015912751664. Its totient is φ = 9687220940800.

The previous prime is 21001012021189. The next prime is 21001012021229. The reversal of 21001012021202 is 20212021010012.

It can be written as a sum of positive squares in 8 ways, for example, as 11295238783921 + 9705773237281 = 3360839^2 + 3115409^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3580199 + ... + 7404042.

Almost surely, 2^{21001012021202} is an apocalyptic number.

21001012021202 is a deficient number, since it is larger than the sum of its proper divisors (13014900730462).

21001012021202 is a wasteful number, since it uses less digits than its factorization.

21001012021202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985374.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001012021202 its reverse (20212021010012), we get a palindrome (41213033031214).

The spelling of 21001012021202 in words is "twenty-one trillion, one billion, twelve million, twenty-one thousand, two hundred two".