21122625750 has 128 divisors (see below), whose sum is σ = 53389784448. Its totient is φ = 5561856000.

The previous prime is 21122625739. The next prime is 21122625751. The reversal of 21122625750 is 5752622112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122625751) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24762324 + ... + 24763176.

It is an arithmetic number, because the mean of its divisors is an integer number (417107691).

Almost surely, 2^21122625750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122625750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26694892224).

21122625750 is an abundant number, since it is smaller than the sum of its proper divisors (32267158698).

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

21122625750 is a wasteful number, since it uses less digits than its factorization.

21122625750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 21122625750 in words is "twenty-one billion, one hundred twenty-two million, six hundred twenty-five thousand, seven hundred fifty".