21215132304 has 40 divisors (see below), whose sum is σ = 54822434592. Its totient is φ = 7069559040.

The previous prime is 21215132299. The next prime is 21215132333. The reversal of 21215132304 is 40323151212.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 96252 + ... + 227364.

Almost surely, 2^21215132304 is an apocalyptic number.

21215132304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21215132304 is an abundant number, since it is smaller than the sum of its proper divisors (33607302288).

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

21215132304 is a wasteful number, since it uses less digits than its factorization.

21215132304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134495 (or 134489 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21215132304 its reverse (40323151212), we get a palindrome (61538283516).

The spelling of 21215132304 in words is "twenty-one billion, two hundred fifteen million, one hundred thirty-two thousand, three hundred four".