21377447334 has 72 divisors (see below), whose sum is σ = 50347422840. Its totient is φ = 6550612992.

The previous prime is 21377447309. The next prime is 21377447369. The reversal of 21377447334 is 43374477312.

It is a self number, because there is not a number n which added to its sum of digits gives 21377447334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 175902 + ... + 271470.

Almost surely, 2^21377447334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21377447334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25173711420).

21377447334 is an abundant number, since it is smaller than the sum of its proper divisors (28969975506).

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

21377447334 is a wasteful number, since it uses less digits than its factorization.

21377447334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95654 (or 95634 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 45.

The spelling of 21377447334 in words is "twenty-one billion, three hundred seventy-seven million, four hundred forty-seven thousand, three hundred thirty-four".