2021021320051 has 2 divisors, whose sum is σ = 2021021320052. Its totient is φ = 2021021320050.

The previous prime is 2021021319949. The next prime is 2021021320069. The reversal of 2021021320051 is 1500231201202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021021320051 - 2³⁵ = 1986661581683 is a prime.

It is a super-2 number, since 2×2021021320051² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021021320091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010510660025 + 1010510660026.

It is an arithmetic number, because the mean of its divisors is an integer number (1010510660026).

Almost surely, 2^{2021021320051} is an apocalyptic number.

2021021320051 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021021320051 is an equidigital number, since it uses as much as digits as its factorization.

2021021320051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 2021021320051 its reverse (1500231201202), we get a palindrome (3521252521253).

The spelling of 2021021320051 in words is "two trillion, twenty-one billion, twenty-one million, three hundred twenty thousand, fifty-one".