21425460637 has 8 divisors (see below), whose sum is σ = 25774990400. Its totient is φ = 17398118304.

The previous prime is 21425460619. The next prime is 21425460649. The reversal of 21425460637 is 73606452412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21425460637 - 2¹⁵ = 21425427869 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 21425460637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425460137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80546712 + ... + 80546977.

It is an arithmetic number, because the mean of its divisors is an integer number (3221873800).

Almost surely, 2^21425460637 is an apocalyptic number.

It is an amenable number.

21425460637 is a deficient number, since it is larger than the sum of its proper divisors (4349529763).

21425460637 is a wasteful number, since it uses less digits than its factorization.

21425460637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161093715.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 21425460637 in words is "twenty-one billion, four hundred twenty-five million, four hundred sixty thousand, six hundred thirty-seven".