21221010122001 has 64 divisors (see below), whose sum is σ = 30225678336000. Its totient is φ = 13204859595840.

The previous prime is 21221010121991. The next prime is 21221010122027. The reversal of 21221010122001 is 10022101012212.

It is not a de Polignac number, because 21221010122001 - 2⁹ = 21221010121489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221010122051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5844396456 + ... + 5844400086.

It is an arithmetic number, because the mean of its divisors is an integer number (472276224000).

Almost surely, 2^{21221010122001} is an apocalyptic number.

It is an amenable number.

21221010122001 is a deficient number, since it is larger than the sum of its proper divisors (9004668213999).

21221010122001 is a wasteful number, since it uses less digits than its factorization.

21221010122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6794.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221010122001 its reverse (10022101012212), we get a palindrome (31243111134213).

The spelling of 21221010122001 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, one hundred twenty-two thousand, one".