21202018051 has 2 divisors, whose sum is σ = 21202018052. Its totient is φ = 21202018050.

The previous prime is 21202018021. The next prime is 21202018067. The reversal of 21202018051 is 15081020212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202018051 - 2⁷ = 21202017923 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202018021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601009025 + 10601009026.

It is an arithmetic number, because the mean of its divisors is an integer number (10601009026).

Almost surely, 2^21202018051 is an apocalyptic number.

21202018051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202018051 is an equidigital number, since it uses as much as digits as its factorization.

21202018051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 21202018051 its reverse (15081020212), we get a palindrome (36283038263).

The spelling of 21202018051 in words is "twenty-one billion, two hundred two million, eighteen thousand, fifty-one".