201221200051 has 2 divisors, whose sum is σ = 201221200052. Its totient is φ = 201221200050.

The previous prime is 201221199979. The next prime is 201221200057. The reversal of 201221200051 is 150002122102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221200051 - 2²⁵ = 201187645619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221199998 and 201221200034.

It is not a weakly prime, because it can be changed into another prime (201221200057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610600025 + 100610600026.

It is an arithmetic number, because the mean of its divisors is an integer number (100610600026).

Almost surely, 2^201221200051 is an apocalyptic number.

201221200051 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221200051 is an equidigital number, since it uses as much as digits as its factorization.

201221200051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 201221200051 its reverse (150002122102), we get a palindrome (351223322153).

The spelling of 201221200051 in words is "two hundred one billion, two hundred twenty-one million, two hundred thousand, fifty-one".