21021212101202 has 16 divisors (see below), whose sum is σ = 33387567354360. Its totient is φ = 9892057663488.

The previous prime is 21021212101157. The next prime is 21021212101223. The reversal of 21021212101202 is 20210121212012.

It can be written as a sum of positive squares in 4 ways, for example, as 8779967536201 + 12241244565001 = 2963101^2 + 3498749^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 7437443 + ... + 9867014.

Almost surely, 2^{21021212101202} is an apocalyptic number.

21021212101202 is a deficient number, since it is larger than the sum of its proper divisors (12366355253158).

21021212101202 is a wasteful number, since it uses less digits than its factorization.

21021212101202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340205.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021212101202 its reverse (20210121212012), we get a palindrome (41231333313214).

The spelling of 21021212101202 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred one thousand, two hundred two".