21174622464 has 144 divisors (see below), whose sum is σ = 56947834944. Its totient is φ = 6984499200.

The previous prime is 21174622453. The next prime is 21174622507. The reversal of 21174622464 is 46422647112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43125259 + ... + 43125749.

It is an arithmetic number, because the mean of its divisors is an integer number (395471076).

Almost surely, 2^21174622464 is an apocalyptic number.

21174622464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21174622464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28473917472).

21174622464 is an abundant number, since it is smaller than the sum of its proper divisors (35773212480).

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

21174622464 is a wasteful number, since it uses less digits than its factorization.

21174622464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 970 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The spelling of 21174622464 in words is "twenty-one billion, one hundred seventy-four million, six hundred twenty-two thousand, four hundred sixty-four".