21394014025 has 6 divisors (see below), whose sum is σ = 26528577422. Its totient is φ = 17115211200.

The previous prime is 21394014023. The next prime is 21394014053. The reversal of 21394014025 is 52041049312.

It can be written as a sum of positive squares in 3 ways, for example, as 6072773184 + 15321240841 = 77928^2 + 123779^2 .

It is not a de Polignac number, because 21394014025 - 2¹ = 21394014023 is a prime.

It is a super-2 number, since 2×21394014025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21394014023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427880256 + ... + 427880305.

Almost surely, 2^21394014025 is an apocalyptic number.

21394014025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21394014025 is a deficient number, since it is larger than the sum of its proper divisors (5134563397).

21394014025 is an equidigital number, since it uses as much as digits as its factorization.

21394014025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855760571 (or 855760566 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21394014025 in words is "twenty-one billion, three hundred ninety-four million, fourteen thousand, twenty-five".