21021120195737 has 2 divisors, whose sum is σ = 21021120195738. Its totient is φ = 21021120195736.

The previous prime is 21021120195599. The next prime is 21021120195749. The reversal of 21021120195737 is 73759102112012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14482774029376 + 6538346166361 = 3805624^2 + 2557019^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021120195737 - 2²⁸ = 21020851760281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021120195694 and 21021120195703.

It is not a weakly prime, because it can be changed into another prime (21021120195137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510560097868 + 10510560097869.

It is an arithmetic number, because the mean of its divisors is an integer number (10510560097869).

Almost surely, 2^{21021120195737} is an apocalyptic number.

It is an amenable number.

21021120195737 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021120195737 is an equidigital number, since it uses as much as digits as its factorization.

21021120195737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 41.

The spelling of 21021120195737 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, one hundred ninety-five thousand, seven hundred thirty-seven".