21522074251751 has 8 divisors (see below), whose sum is σ = 21567570732864. Its totient is φ = 21476593815040.

The previous prime is 21522074251747. The next prime is 21522074251759. The reversal of 21522074251751 is 15715247022512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21522074251751 - 2² = 21522074251747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522074251759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323551 + ... + 6692976.

It is an arithmetic number, because the mean of its divisors is an integer number (2695946341608).

Almost surely, 2^{21522074251751} is an apocalyptic number.

21522074251751 is a deficient number, since it is larger than the sum of its proper divisors (45496481113).

21522074251751 is an equidigital number, since it uses as much as digits as its factorization.

21522074251751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022201.

The product of its (nonzero) digits is 392000, while the sum is 44.

The spelling of 21522074251751 in words is "twenty-one trillion, five hundred twenty-two billion, seventy-four million, two hundred fifty-one thousand, seven hundred fifty-one".