21305860963452 has 144 divisors (see below), whose sum is σ = 58165648908640. Its totient is φ = 6536853840384.

The previous prime is 21305860963433. The next prime is 21305860963469. The reversal of 21305860963452 is 25436906850312.

It is a happy number.

21305860963452 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 586 + 0 + 9 + 6 + 3 + 4 + 52 = 666.

It is a super-2 number, since 2×21305860963452² (a number of 27 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 47 ways as a sum of consecutive naturals, for example, 964360518 + ... + 964382610.

Almost surely, 2^{21305860963452} 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 21305860963452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29082824454320).

21305860963452 is an abundant number, since it is smaller than the sum of its proper divisors (36859787945188).

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

21305860963452 is a wasteful number, since it uses less digits than its factorization.

21305860963452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27932 (or 27927 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 21305860963452 in words is "twenty-one trillion, three hundred five billion, eight hundred sixty million, nine hundred sixty-three thousand, four hundred fifty-two".