21073455480 has 384 divisors, whose sum is σ = 82104295680. Its totient is φ = 4276500480.

The previous prime is 21073455443. The next prime is 21073455499. The reversal of 21073455480 is 8455437012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2777452 + ... + 2785028.

It is an arithmetic number, because the mean of its divisors is an integer number (213813270).

Almost surely, 2^21073455480 is an apocalyptic number.

21073455480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21073455480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41052147840).

21073455480 is an abundant number, since it is smaller than the sum of its proper divisors (61030840200).

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

21073455480 is a wasteful number, since it uses less digits than its factorization.

21073455480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7659 (or 7648 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 21073455480 in words is "twenty-one billion, seventy-three million, four hundred fifty-five thousand, four hundred eighty".