21274351424 has 28 divisors (see below), whose sum is σ = 42603610500. Its totient is φ = 10539583488.

The previous prime is 21274351409. The next prime is 21274351453. The reversal of 21274351424 is 42415347212.

It can be written as a sum of positive squares in 2 ways, for example, as 19035169024 + 2239182400 = 137968^2 + 47320^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517849 + ... + 1531800.

Almost surely, 2^21274351424 is an apocalyptic number.

It is an amenable number.

21274351424 is an abundant number, since it is smaller than the sum of its proper divisors (21329259076).

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

21274351424 is a wasteful number, since it uses less digits than its factorization.

21274351424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049770 (or 3049760 counting only the distinct ones).

The product of its digits is 53760, while the sum is 35.

Adding to 21274351424 its reverse (42415347212), we get a palindrome (63689698636).

The spelling of 21274351424 in words is "twenty-one billion, two hundred seventy-four million, three hundred fifty-one thousand, four hundred twenty-four".