21221100122201 has 4 divisors (see below), whose sum is σ = 24252685853952. Its totient is φ = 18189514390452.

The previous prime is 21221100122177. The next prime is 21221100122207. The reversal of 21221100122201 is 10222100112212.

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 21221100122201 - 2¹⁴ = 21221100105817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221100122201.

It is not an unprimeable number, because it can be changed into a prime (21221100122207) 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, 1515792865865 + ... + 1515792865878.

It is an arithmetic number, because the mean of its divisors is an integer number (6063171463488).

Almost surely, 2^{21221100122201} is an apocalyptic number.

It is an amenable number.

21221100122201 is a deficient number, since it is larger than the sum of its proper divisors (3031585731751).

21221100122201 is an equidigital number, since it uses as much as digits as its factorization.

21221100122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031585731750.

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

Adding to 21221100122201 its reverse (10222100112212), we get a palindrome (31443200234413).

The spelling of 21221100122201 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-two thousand, two hundred one".