2021312551 has 2 divisors, whose sum is σ = 2021312552. Its totient is φ = 2021312550.

The previous prime is 2021312533. The next prime is 2021312581. The reversal of 2021312551 is 1552131202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021312551 - 2¹³ = 2021304359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021312521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010656275 + 1010656276.

It is an arithmetic number, because the mean of its divisors is an integer number (1010656276).

Almost surely, 2^2021312551 is an apocalyptic number.

2021312551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021312551 is an equidigital number, since it uses as much as digits as its factorization.

2021312551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 2021312551 is about 44959.0096754811. The cubic root of 2021312551 is about 1264.3806017425.

Adding to 2021312551 its reverse (1552131202), we get a palindrome (3573443753).

The spelling of 2021312551 in words is "two billion, twenty-one million, three hundred twelve thousand, five hundred fifty-one".