21228488526 has 128 divisors (see below), whose sum is σ = 51483672576. Its totient is φ = 5704680960.

The previous prime is 21228488461. The next prime is 21228488573. The reversal of 21228488526 is 62588482212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21727750 + ... + 21728726.

It is an arithmetic number, because the mean of its divisors is an integer number (402216192).

Almost surely, 2^21228488526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21228488526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25741836288).

21228488526 is an abundant number, since it is smaller than the sum of its proper divisors (30255184050).

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

21228488526 is a wasteful number, since it uses less digits than its factorization.

21228488526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366.

The product of its digits is 983040, while the sum is 48.

The spelling of 21228488526 in words is "twenty-one billion, two hundred twenty-eight million, four hundred eighty-eight thousand, five hundred twenty-six".