21487455437 has 8 divisors (see below), whose sum is σ = 24680496000. Its totient is φ = 18325265904.

The previous prime is 21487455397. The next prime is 21487455463. The reversal of 21487455437 is 73455478412.

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

It is a cyclic number.

It is not a de Polignac number, because 21487455437 - 2¹² = 21487451341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21487455637) 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, 7711262 + ... + 7714047.

It is an arithmetic number, because the mean of its divisors is an integer number (3085062000).

Almost surely, 2^21487455437 is an apocalyptic number.

It is an amenable number.

21487455437 is a deficient number, since it is larger than the sum of its proper divisors (3193040563).

21487455437 is a wasteful number, since it uses less digits than its factorization.

21487455437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15425515.

The product of its digits is 3763200, while the sum is 50.

The spelling of 21487455437 in words is "twenty-one billion, four hundred eighty-seven million, four hundred fifty-five thousand, four hundred thirty-seven".