21313124570 has 64 divisors (see below), whose sum is σ = 43848241920. Its totient is φ = 7410213888.

The previous prime is 21313124533. The next prime is 21313124611. The reversal of 21313124570 is 7542131312.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19409 + ... + 207371.

It is an arithmetic number, because the mean of its divisors is an integer number (685128780).

Almost surely, 2^21313124570 is an apocalyptic number.

21313124570 is an abundant number, since it is smaller than the sum of its proper divisors (22535117350).

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

21313124570 is a wasteful number, since it uses less digits than its factorization.

21313124570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188039.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 21313124570 its reverse (7542131312), we get a palindrome (28855255882).

The spelling of 21313124570 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-four thousand, five hundred seventy".