21528462460 has 24 divisors (see below), whose sum is σ = 45462347280. Its totient is φ = 8563275264.

The previous prime is 21528462443. The next prime is 21528462467. The reversal of 21528462460 is 6426482512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21528462467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3003189 + ... + 3010348.

It is an arithmetic number, because the mean of its divisors is an integer number (1894264470).

Almost surely, 2^21528462460 is an apocalyptic number.

21528462460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21528462460 is an abundant number, since it is smaller than the sum of its proper divisors (23933884820).

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

21528462460 is a wasteful number, since it uses less digits than its factorization.

21528462460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013725 (or 6013723 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 21528462460 in words is "twenty-one billion, five hundred twenty-eight million, four hundred sixty-two thousand, four hundred sixty".