21254823750 has 160 divisors (see below), whose sum is σ = 57208187520. Its totient is φ = 5243200000.

The previous prime is 21254823749. The next prime is 21254823797. The reversal of 21254823750 is 5732845212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21254823699 and 21254823708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3758425 + ... + 3764075.

It is an arithmetic number, because the mean of its divisors is an integer number (357551172).

Almost surely, 2^21254823750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21254823750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28604093760).

21254823750 is an abundant number, since it is smaller than the sum of its proper divisors (35953363770).

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

21254823750 is a wasteful number, since it uses less digits than its factorization.

21254823750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752 (or 5737 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 21254823750 in words is "twenty-one billion, two hundred fifty-four million, eight hundred twenty-three thousand, seven hundred fifty".