21460307456 has 60 divisors (see below), whose sum is σ = 49024263288. Its totient is φ = 9193516032.

The previous prime is 21460307437. The next prime is 21460307513. The reversal of 21460307456 is 65470306412.

It is a happy number.

It is a super-2 number, since 2×21460307456² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8768825 + ... + 8771271.

Almost surely, 2^21460307456 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 21460307456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24512131644).

21460307456 is an abundant number, since it is smaller than the sum of its proper divisors (27563955832).

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

21460307456 is an frugal number, since it uses more digits than its factorization.

21460307456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 21460307456 in words is "twenty-one billion, four hundred sixty million, three hundred seven thousand, four hundred fifty-six".