21357409224 has 16 divisors (see below), whose sum is σ = 53393523120. Its totient is φ = 7119136400.

The previous prime is 21357409141. The next prime is 21357409273. The reversal of 21357409224 is 42290475312.

It is a super-2 number, since 2×21357409224² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444946002 + ... + 444946049.

It is an arithmetic number, because the mean of its divisors is an integer number (3337095195).

Almost surely, 2^21357409224 is an apocalyptic number.

21357409224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21357409224 is an abundant number, since it is smaller than the sum of its proper divisors (32036113896).

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

21357409224 is a wasteful number, since it uses less digits than its factorization.

21357409224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889892060 (or 889892056 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21357409224 in words is "twenty-one billion, three hundred fifty-seven million, four hundred nine thousand, two hundred twenty-four".