21089571025920 has 528 divisors, whose sum is σ = 69832192258944. Its totient is φ = 5431721984000.

The previous prime is 21089571025907. The next prime is 21089571025933. The reversal of 21089571025920 is 2952017598012.

It is an interprime number because it is at equal distance from previous prime (21089571025907) and next prime (21089571025933).

It is a super-2 number, since 2×21089571025920² (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, 2607832117 + ... + 2607840203.

Almost surely, 2^{21089571025920} is an apocalyptic number.

21089571025920 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 21089571025920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34916096129472).

21089571025920 is an abundant number, since it is smaller than the sum of its proper divisors (48742621233024).

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

21089571025920 is a wasteful number, since it uses less digits than its factorization.

21089571025920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298 (or 8239 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 21089571025920 in words is "twenty-one trillion, eighty-nine billion, five hundred seventy-one million, twenty-five thousand, nine hundred twenty".