21241572464 has 40 divisors (see below), whose sum is σ = 48656811360. Its totient is φ = 8789614848.

The previous prime is 21241572427. The next prime is 21241572487. The reversal of 21241572464 is 46427514212.

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, 3266699 + ... + 3273194.

It is an arithmetic number, because the mean of its divisors is an integer number (1216420284).

Almost surely, 2^21241572464 is an apocalyptic number.

It is an amenable number.

21241572464 is an abundant number, since it is smaller than the sum of its proper divisors (27415238896).

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

21241572464 is a wasteful number, since it uses less digits than its factorization.

21241572464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6539937 (or 6539931 counting only the distinct ones).

The product of its digits is 107520, while the sum is 38.

The spelling of 21241572464 in words is "twenty-one billion, two hundred forty-one million, five hundred seventy-two thousand, four hundred sixty-four".