21012002212201 has 32 divisors (see below), whose sum is σ = 28369527782400. Its totient is φ = 15029094818880.

The previous prime is 21012002212169. The next prime is 21012002212297. The reversal of 21012002212201 is 10221220021012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21012002212201 - 2⁵ = 21012002212169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012002212001) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 58454931 + ... + 58813288.

It is an arithmetic number, because the mean of its divisors is an integer number (886547743200).

Almost surely, 2^{21012002212201} is an apocalyptic number.

It is an amenable number.

21012002212201 is a deficient number, since it is larger than the sum of its proper divisors (7357525570199).

21012002212201 is a wasteful number, since it uses less digits than its factorization.

21012002212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117268429.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012002212201 its reverse (10221220021012), we get a palindrome (31233222233213).

The spelling of 21012002212201 in words is "twenty-one trillion, twelve billion, two million, two hundred twelve thousand, two hundred one".