21872372574 has 64 divisors (see below), whose sum is σ = 47887580160. Its totient is φ = 6619155840.

The previous prime is 21872372573. The next prime is 21872372591. The reversal of 21872372574 is 47527327812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872372573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3754584 + ... + 3760404.

It is an arithmetic number, because the mean of its divisors is an integer number (748243440).

Almost surely, 2^21872372574 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21872372574, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23943790080).

21872372574 is an abundant number, since it is smaller than the sum of its proper divisors (26015207586).

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

21872372574 is a wasteful number, since it uses less digits than its factorization.

21872372574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6625.

The product of its digits is 1317120, while the sum is 48.

The spelling of 21872372574 in words is "twenty-one billion, eight hundred seventy-two million, three hundred seventy-two thousand, five hundred seventy-four".