21522487079 has 8 divisors (see below), whose sum is σ = 21985259520. Its totient is φ = 21059916696.

The previous prime is 21522487027. The next prime is 21522487081. The reversal of 21522487079 is 97078422512.

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 21522487079 - 2¹² = 21522482983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522487279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175562 + ... + 271784.

It is an arithmetic number, because the mean of its divisors is an integer number (2748157440).

Almost surely, 2^21522487079 is an apocalyptic number.

21522487079 is a deficient number, since it is larger than the sum of its proper divisors (462772441).

21522487079 is an equidigital number, since it uses as much as digits as its factorization.

21522487079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101029.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 21522487079 in words is "twenty-one billion, five hundred twenty-two million, four hundred eighty-seven thousand, seventy-nine".