21073526641 has 2 divisors, whose sum is σ = 21073526642. Its totient is φ = 21073526640.

The previous prime is 21073526633. The next prime is 21073526651. The reversal of 21073526641 is 14662537012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12702191616 + 8371335025 = 112704^2 + 91495^2 .

It is a cyclic number.

It is not a de Polignac number, because 21073526641 - 2³ = 21073526633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21073526641.

It is not a weakly prime, because it can be changed into another prime (21073526651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536763320 + 10536763321.

It is an arithmetic number, because the mean of its divisors is an integer number (10536763321).

Almost surely, 2^21073526641 is an apocalyptic number.

It is an amenable number.

21073526641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073526641 is an equidigital number, since it uses as much as digits as its factorization.

21073526641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 21073526641 in words is "twenty-one billion, seventy-three million, five hundred twenty-six thousand, six hundred forty-one".