21325053689856 has 1104 divisors, whose sum is σ = 75725633110400. Its totient is φ = 5992989327360.

The previous prime is 21325053689791. The next prime is 21325053689867. The reversal of 21325053689856 is 65898635052312.

It is a happy number.

21325053689856 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 5 + 0 + 536 + 8 + 98 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 21325053689793 and 21325053689802.

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, 349591044066 + ... + 349591044126.

Almost surely, 2^{21325053689856} 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 21325053689856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37862816555200).

21325053689856 is an abundant number, since it is smaller than the sum of its proper divisors (54400579420544).

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

21325053689856 is an frugal number, since it uses more digits than its factorization.

21325053689856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 93312000, while the sum is 63.

The spelling of 21325053689856 in words is "twenty-one trillion, three hundred twenty-five billion, fifty-three million, six hundred eighty-nine thousand, eight hundred fifty-six".