21792490625 has 12 divisors (see below), whose sum is σ = 27238873788. Its totient is φ = 17433990000.

The previous prime is 21792490619. The next prime is 21792490627. The reversal of 21792490625 is 52609429712.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 15938557504 + 5853933121 = 126248^2 + 76511^2 .

It is not a de Polignac number, because 21792490625 - 2²⁸ = 21524055169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21792490625.

It is not an unprimeable number, because it can be changed into a prime (21792490627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3483674 + ... + 3489923.

It is an arithmetic number, because the mean of its divisors is an integer number (2269906149).

Almost surely, 2^21792490625 is an apocalyptic number.

21792490625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21792490625 is a deficient number, since it is larger than the sum of its proper divisors (5446383163).

21792490625 is an frugal number, since it uses more digits than its factorization.

21792490625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973622 (or 6973602 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 21792490625 in words is "twenty-one billion, seven hundred ninety-two million, four hundred ninety thousand, six hundred twenty-five".