21222201202051 has 2 divisors, whose sum is σ = 21222201202052. Its totient is φ = 21222201202050.

The previous prime is 21222201202043. The next prime is 21222201202061. The reversal of 21222201202051 is 15020210222212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222201202051 - 2³ = 21222201202043 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222201202061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611100601025 + 10611100601026.

It is an arithmetic number, because the mean of its divisors is an integer number (10611100601026).

Almost surely, 2^{21222201202051} is an apocalyptic number.

21222201202051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222201202051 is an equidigital number, since it uses as much as digits as its factorization.

21222201202051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21222201202051 its reverse (15020210222212), we get a palindrome (36242411424263).

The spelling of 21222201202051 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred two thousand, fifty-one".