21317389670 has 16 divisors (see below), whose sum is σ = 38572201728. Its totient is φ = 8482311360.

The previous prime is 21317389669. The next prime is 21317389673. The reversal of 21317389670 is 7698371312.

It is a super-2 number, since 2×21317389670² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21317389673) 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, 5578559 + ... + 5582378.

It is an arithmetic number, because the mean of its divisors is an integer number (2410762608).

Almost surely, 2^21317389670 is an apocalyptic number.

21317389670 is a deficient number, since it is larger than the sum of its proper divisors (17254812058).

21317389670 is a wasteful number, since it uses less digits than its factorization.

21317389670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11161135.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 21317389670 in words is "twenty-one billion, three hundred seventeen million, three hundred eighty-nine thousand, six hundred seventy".