21001202002122 has 16 divisors (see below), whose sum is σ = 42092344917792. Its totient is φ = 6985410515120.

The previous prime is 21001202002093. The next prime is 21001202002139. The reversal of 21001202002122 is 22120020210012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3747535029 + ... + 3747540632.

It is an arithmetic number, because the mean of its divisors is an integer number (2630771557362).

Almost surely, 2^{21001202002122} is an apocalyptic number.

21001202002122 is an abundant number, since it is smaller than the sum of its proper divisors (21091142915670).

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

21001202002122 is a wasteful number, since it uses less digits than its factorization.

21001202002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7495076133.

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

Adding to 21001202002122 its reverse (22120020210012), we get a palindrome (43121222212134).

The spelling of 21001202002122 in words is "twenty-one trillion, one billion, two hundred two million, two thousand, one hundred twenty-two".