21800253751 has 2 divisors, whose sum is σ = 21800253752. Its totient is φ = 21800253750.

The previous prime is 21800253743. The next prime is 21800253757. The reversal of 21800253751 is 15735200812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21800253751 - 2³ = 21800253743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21800253757) 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, 10900126875 + 10900126876.

It is an arithmetic number, because the mean of its divisors is an integer number (10900126876).

Almost surely, 2^21800253751 is an apocalyptic number.

21800253751 is a deficient number, since it is larger than the sum of its proper divisors (1).

21800253751 is an equidigital number, since it uses as much as digits as its factorization.

21800253751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 21800253751 in words is "twenty-one billion, eight hundred million, two hundred fifty-three thousand, seven hundred fifty-one".