21947980523 has 8 divisors (see below), whose sum is σ = 25617096192. Its totient is φ = 18412287336.

The previous prime is 21947980519. The next prime is 21947980601. The reversal of 21947980523 is 32508974912.

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 21947980523 - 2² = 21947980519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21947980823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33355265 + ... + 33355922.

It is an arithmetic number, because the mean of its divisors is an integer number (3202137024).

Almost surely, 2^21947980523 is an apocalyptic number.

21947980523 is a deficient number, since it is larger than the sum of its proper divisors (3669115669).

21947980523 is an equidigital number, since it uses as much as digits as its factorization.

21947980523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66711241.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 21947980523 in words is "twenty-one billion, nine hundred forty-seven million, nine hundred eighty thousand, five hundred twenty-three".