21239876754 has 16 divisors (see below), whose sum is σ = 47199726240. Its totient is φ = 7079958900.

The previous prime is 21239876741. The next prime is 21239876767. The reversal of 21239876754 is 45767893212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21239876741) and next prime (21239876767).

It is a super-2 number, since 2×21239876754² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 393331051 = 21239876754 / (2 + 1 + 2 + 3 + 9 + 8 + 7 + 6 + 7 + 5 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 21239876754.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196665472 + ... + 196665579.

It is an arithmetic number, because the mean of its divisors is an integer number (2949982890).

Almost surely, 2^21239876754 is an apocalyptic number.

21239876754 is an abundant number, since it is smaller than the sum of its proper divisors (25959849486).

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

21239876754 is a wasteful number, since it uses less digits than its factorization.

21239876754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393331062 (or 393331056 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 21239876754 in words is "twenty-one billion, two hundred thirty-nine million, eight hundred seventy-six thousand, seven hundred fifty-four".