21613457304 has 48 divisors (see below), whose sum is σ = 58605237600. Its totient is φ = 7196019264.

The previous prime is 21613457279. The next prime is 21613457321. The reversal of 21613457304 is 40375431612.

21613457304 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 345 + 7 + 304 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114544 + ... + 237375.

It is an arithmetic number, because the mean of its divisors is an integer number (1220942450).

Almost surely, 2^21613457304 is an apocalyptic number.

21613457304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21613457304 is an abundant number, since it is smaller than the sum of its proper divisors (36991780296).

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

21613457304 is a wasteful number, since it uses less digits than its factorization.

21613457304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352784 (or 352777 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

Adding to 21613457304 its reverse (40375431612), we get a palindrome (61988888916).

The spelling of 21613457304 in words is "twenty-one billion, six hundred thirteen million, four hundred fifty-seven thousand, three hundred four".