21850465152 has 128 divisors (see below), whose sum is σ = 60662027520. Its totient is φ = 6955520000.

The previous prime is 21850465151. The next prime is 21850465159. The reversal of 21850465152 is 25156405812.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 21850465152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21850465151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6719527 + ... + 6722777.

It is an arithmetic number, because the mean of its divisors is an integer number (473922090).

Almost surely, 2^21850465152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21850465152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30331013760).

21850465152 is an abundant number, since it is smaller than the sum of its proper divisors (38811562368).

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

21850465152 is a wasteful number, since it uses less digits than its factorization.

21850465152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052 (or 4040 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 39.

The spelling of 21850465152 in words is "twenty-one billion, eight hundred fifty million, four hundred sixty-five thousand, one hundred fifty-two".