201621235051 has 2 divisors, whose sum is σ = 201621235052. Its totient is φ = 201621235050.

The previous prime is 201621235043. The next prime is 201621235061. The reversal of 201621235051 is 150532126102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201621235051 - 2³ = 201621235043 is a prime.

It is a super-2 number, since 2×201621235051² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201621235061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100810617525 + 100810617526.

It is an arithmetic number, because the mean of its divisors is an integer number (100810617526).

Almost surely, 2^201621235051 is an apocalyptic number.

201621235051 is a deficient number, since it is larger than the sum of its proper divisors (1).

201621235051 is an equidigital number, since it uses as much as digits as its factorization.

201621235051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 201621235051 in words is "two hundred one billion, six hundred twenty-one million, two hundred thirty-five thousand, fifty-one".