21134400024 has 32 divisors (see below), whose sum is σ = 52860852720. Its totient is φ = 7041486336.

The previous prime is 21134399989. The next prime is 21134400031. The reversal of 21134400024 is 42000443112.

It is a congruent number.

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, 154749 + ... + 257324.

Almost surely, 2^21134400024 is an apocalyptic number.

21134400024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21134400024 is an abundant number, since it is smaller than the sum of its proper divisors (31726452696).

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

21134400024 is a wasteful number, since it uses less digits than its factorization.

21134400024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414219 (or 414215 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21134400024 its reverse (42000443112), we get a palindrome (63134843136).

The spelling of 21134400024 in words is "twenty-one billion, one hundred thirty-four million, four hundred thousand, twenty-four".