21470025641 has 2 divisors, whose sum is σ = 21470025642. Its totient is φ = 21470025640.

The previous prime is 21470025589. The next prime is 21470025691. The reversal of 21470025641 is 14652007412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14114390416 + 7355635225 = 118804^2 + 85765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470025641 is a prime.

It is a Sophie Germain prime.

21470025641 is a modest number, since divided by 25641 gives 21470 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21470025598 and 21470025607.

It is not a weakly prime, because it can be changed into another prime (21470025691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735012820 + 10735012821.

It is an arithmetic number, because the mean of its divisors is an integer number (10735012821).

Almost surely, 2^21470025641 is an apocalyptic number.

It is an amenable number.

21470025641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470025641 is an equidigital number, since it uses as much as digits as its factorization.

21470025641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21470025641 in words is "twenty-one billion, four hundred seventy million, twenty-five thousand, six hundred forty-one".