21254453170560 has 512 divisors, whose sum is σ = 76886216064000. Its totient is φ = 5547779112960.

The previous prime is 21254453170477. The next prime is 21254453170603. The reversal of 21254453170560 is 6507135445212.

21254453170560 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 44 + 531 + 70 + 5 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 170474004 + ... + 170598636.

It is an arithmetic number, because the mean of its divisors is an integer number (150168390750).

Almost surely, 2^{21254453170560} is an apocalyptic number.

21254453170560 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 21254453170560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38443108032000).

21254453170560 is an abundant number, since it is smaller than the sum of its proper divisors (55631762893440).

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

21254453170560 is a wasteful number, since it uses less digits than its factorization.

21254453170560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124871 (or 124853 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 21254453170560 in words is "twenty-one trillion, two hundred fifty-four billion, four hundred fifty-three million, one hundred seventy thousand, five hundred sixty".