21202221122001 has 20 divisors (see below), whose sum is σ = 31811980030512. Its totient is φ = 14072546165688.

The previous prime is 21202221121987. The next prime is 21202221122021. The reversal of 21202221122001 is 10022112220212.

It is a happy number.

21202221122001 is a `hidden beast` number, since 21 + 202 + 221 + 1 + 220 + 0 + 1 = 666.

It is not a de Polignac number, because 21202221122001 - 2⁵ = 21202221121969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21202221122021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 576536275 + ... + 576573048.

Almost surely, 2^{21202221122001} is an apocalyptic number.

It is an amenable number.

21202221122001 is a deficient number, since it is larger than the sum of its proper divisors (10609758908511).

21202221122001 is a wasteful number, since it uses less digits than its factorization.

21202221122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153109562 (or 1153109553 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21202221122001 its reverse (10022112220212), we get a palindrome (31224333342213).

The spelling of 21202221122001 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, one hundred twenty-two thousand, one".