2021761874551 has 2 divisors, whose sum is σ = 2021761874552. Its totient is φ = 2021761874550.

The previous prime is 2021761874519. The next prime is 2021761874579. The reversal of 2021761874551 is 1554781671202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021761874551 - 2⁵ = 2021761874519 is a prime.

It is a super-2 number, since 2×2021761874551² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021761874495 and 2021761874504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021761874051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010880937275 + 1010880937276.

It is an arithmetic number, because the mean of its divisors is an integer number (1010880937276).

Almost surely, 2^{2021761874551} is an apocalyptic number.

2021761874551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021761874551 is an equidigital number, since it uses as much as digits as its factorization.

2021761874551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 2021761874551 in words is "two trillion, twenty-one billion, seven hundred sixty-one million, eight hundred seventy-four thousand, five hundred fifty-one".