21725243460522 has 128 divisors (see below), whose sum is σ = 56524520908800. Its totient is φ = 6055435324800.

The previous prime is 21725243460497. The next prime is 21725243460533. The reversal of 21725243460522 is 22506434252712.

21725243460522 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 5 + 2 + 4 + 34 + 605 + 2 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 321255229 + ... + 321322847.

It is an arithmetic number, because the mean of its divisors is an integer number (441597819600).

Almost surely, 2^{21725243460522} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21725243460522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28262260454400).

21725243460522 is an abundant number, since it is smaller than the sum of its proper divisors (34799277448278).

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

21725243460522 is a wasteful number, since it uses less digits than its factorization.

21725243460522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88409 (or 88403 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 45.

It can be divided in two parts, 2172524 and 3460522, that added together give a triangular number (5633046 = T₃₃₅₆).

The spelling of 21725243460522 in words is "twenty-one trillion, seven hundred twenty-five billion, two hundred forty-three million, four hundred sixty thousand, five hundred twenty-two".