21112000199957 has 2 divisors, whose sum is σ = 21112000199958. Its totient is φ = 21112000199956.

The previous prime is 21112000199929. The next prime is 21112000199989. The reversal of 21112000199957 is 75999100021112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12535501383601 + 8576498816356 = 3540551^2 + 2928566^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112000199957 - 2³⁶ = 21043280723221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112000499957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556000099978 + 10556000099979.

It is an arithmetic number, because the mean of its divisors is an integer number (10556000099979).

Almost surely, 2^{21112000199957} is an apocalyptic number.

It is an amenable number.

21112000199957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112000199957 is an equidigital number, since it uses as much as digits as its factorization.

21112000199957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 47.

The spelling of 21112000199957 in words is "twenty-one trillion, one hundred twelve billion, one hundred ninety-nine thousand, nine hundred fifty-seven".