21751425297020 has 48 divisors (see below), whose sum is σ = 46793624457888. Its totient is φ = 8488082826240.

The previous prime is 21751425297001. The next prime is 21751425297029. The reversal of 21751425297020 is 2079252415712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751425297029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25539779 + ... + 26377701.

It is an arithmetic number, because the mean of its divisors is an integer number (974867176206).

Almost surely, 2^{21751425297020} is an apocalyptic number.

21751425297020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21751425297020 is an abundant number, since it is smaller than the sum of its proper divisors (25042199160868).

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

21751425297020 is a wasteful number, since it uses less digits than its factorization.

21751425297020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869630 (or 869628 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 21751425297020 in words is "twenty-one trillion, seven hundred fifty-one billion, four hundred twenty-five million, two hundred ninety-seven thousand, twenty".