21413320425 has 36 divisors (see below), whose sum is σ = 43832730240. Its totient is φ = 9788945760.

The previous prime is 21413320421. The next prime is 21413320483. The reversal of 21413320425 is 52402331412.

21413320425 is a `hidden beast` number, since 21 + 413 + 3 + 204 + 25 = 666.

It is not a de Polignac number, because 21413320425 - 2² = 21413320421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21413320421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6796305 + ... + 6799454.

It is an arithmetic number, because the mean of its divisors is an integer number (1217575840).

Almost surely, 2^21413320425 is an apocalyptic number.

21413320425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21413320425 is an abundant number, since it is smaller than the sum of its proper divisors (22419409815).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21413320425 is a wasteful number, since it uses less digits than its factorization.

21413320425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595782 (or 13595774 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21413320425 its reverse (52402331412), we get a palindrome (73815651837).

The spelling of 21413320425 in words is "twenty-one billion, four hundred thirteen million, three hundred twenty thousand, four hundred twenty-five".