21064625419 has 2 divisors, whose sum is σ = 21064625420. Its totient is φ = 21064625418.

The previous prime is 21064625399. The next prime is 21064625423. The reversal of 21064625419 is 91452646012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21064625419 - 2⁹ = 21064624907 is a prime.

It is a super-2 number, since 2×21064625419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21064625819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532312709 + 10532312710.

It is an arithmetic number, because the mean of its divisors is an integer number (10532312710).

Almost surely, 2^21064625419 is an apocalyptic number.

21064625419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064625419 is an equidigital number, since it uses as much as digits as its factorization.

21064625419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21064625419 in words is "twenty-one billion, sixty-four million, six hundred twenty-five thousand, four hundred nineteen".