21030662620 has 96 divisors (see below), whose sum is σ = 51285830400. Its totient is φ = 7163481600.

The previous prime is 21030662567. The next prime is 21030662633. The reversal of 21030662620 is 2626603012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343755 + ... + 400285.

It is an arithmetic number, because the mean of its divisors is an integer number (534227400).

Almost surely, 2^21030662620 is an apocalyptic number.

21030662620 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 21030662620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25642915200).

21030662620 is an abundant number, since it is smaller than the sum of its proper divisors (30255167780).

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

21030662620 is a wasteful number, since it uses less digits than its factorization.

21030662620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56659 (or 56657 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21030662620 in words is "twenty-one billion, thirty million, six hundred sixty-two thousand, six hundred twenty".