21470666504637 has 16 divisors (see below), whose sum is σ = 32717553523200. Its totient is φ = 12268822005552.

The previous prime is 21470666504549. The next prime is 21470666504647. The reversal of 21470666504637 is 73640566607412.

It is a happy number.

It is not a de Polignac number, because 21470666504637 - 2¹⁰ = 21470666503613 is a prime.

It is a super-2 number, since 2×21470666504637² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470666504647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3385887 + ... + 7376012.

It is an arithmetic number, because the mean of its divisors is an integer number (2044847095200).

Almost surely, 2^{21470666504637} is an apocalyptic number.

It is an amenable number.

21470666504637 is a deficient number, since it is larger than the sum of its proper divisors (11246887018563).

21470666504637 is a wasteful number, since it uses less digits than its factorization.

21470666504637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10856912.

The product of its (nonzero) digits is 30481920, while the sum is 57.

The spelling of 21470666504637 in words is "twenty-one trillion, four hundred seventy billion, six hundred sixty-six million, five hundred four thousand, six hundred thirty-seven".