2101999952551 has 2 divisors, whose sum is σ = 2101999952552. Its totient is φ = 2101999952550.

The previous prime is 2101999952519. The next prime is 2101999952557. The reversal of 2101999952551 is 1552599991012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101999952551 - 2⁵ = 2101999952519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101999952557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050999976275 + 1050999976276.

It is an arithmetic number, because the mean of its divisors is an integer number (1050999976276).

Almost surely, 2^{2101999952551} is an apocalyptic number.

2101999952551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101999952551 is an equidigital number, since it uses as much as digits as its factorization.

2101999952551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3280500, while the sum is 58.

The spelling of 2101999952551 in words is "two trillion, one hundred one billion, nine hundred ninety-nine million, nine hundred fifty-two thousand, five hundred fifty-one".