21375724677250 has 192 divisors, whose sum is σ = 43185198760704. Its totient is φ = 7919482368000.

The previous prime is 21375724677217. The next prime is 21375724677259. The reversal of 21375724677250 is 5277642757312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21375724677259) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3041938237 + ... + 3041945263.

It is an arithmetic number, because the mean of its divisors is an integer number (224922910212).

Almost surely, 2^{21375724677250} is an apocalyptic number.

21375724677250 is an abundant number, since it is smaller than the sum of its proper divisors (21809474083454).

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

21375724677250 is a wasteful number, since it uses less digits than its factorization.

21375724677250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7742 (or 7715 counting only the distinct ones).

The product of its (nonzero) digits is 34574400, while the sum is 58.

The spelling of 21375724677250 in words is "twenty-one trillion, three hundred seventy-five billion, seven hundred twenty-four million, six hundred seventy-seven thousand, two hundred fifty".