21210122012201 has 4 divisors (see below), whose sum is σ = 21210392810832. Its totient is φ = 21209851213572.

The previous prime is 21210122012179. The next prime is 21210122012291. The reversal of 21210122012201 is 10221022101212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210122012201 - 2²² = 21210117817897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210122012201.

It is not an unprimeable number, because it can be changed into a prime (21210122012291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135281795 + ... + 135438488.

It is an arithmetic number, because the mean of its divisors is an integer number (5302598202708).

Almost surely, 2^{21210122012201} is an apocalyptic number.

It is an amenable number.

21210122012201 is a deficient number, since it is larger than the sum of its proper divisors (270798631).

21210122012201 is an equidigital number, since it uses as much as digits as its factorization.

21210122012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270798630.

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

Adding to 21210122012201 its reverse (10221022101212), we get a palindrome (31431144113413).

The spelling of 21210122012201 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, twelve thousand, two hundred one".