21492315376 has 80 divisors (see below), whose sum is σ = 49164853248. Its totient is φ = 8906688000.

The previous prime is 21492315373. The next prime is 21492315389. The reversal of 21492315376 is 67351329412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492315373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8161356 + ... + 8163988.

Almost surely, 2^21492315376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21492315376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24582426624).

21492315376 is an abundant number, since it is smaller than the sum of its proper divisors (27672537872).

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

21492315376 is a wasteful number, since it uses less digits than its factorization.

21492315376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030 (or 5024 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The spelling of 21492315376 in words is "twenty-one billion, four hundred ninety-two million, three hundred fifteen thousand, three hundred seventy-six".