21522531401 has 4 divisors (see below), whose sum is σ = 24597178752. Its totient is φ = 18447884052.

The previous prime is 21522531383. The next prime is 21522531413. The reversal of 21522531401 is 10413522512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21522531401 - 2²² = 21518337097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21522531421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537323665 + ... + 1537323678.

It is an arithmetic number, because the mean of its divisors is an integer number (6149294688).

Almost surely, 2^21522531401 is an apocalyptic number.

It is an amenable number.

21522531401 is a deficient number, since it is larger than the sum of its proper divisors (3074647351).

21522531401 is an equidigital number, since it uses as much as digits as its factorization.

21522531401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074647350.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 21522531401 in words is "twenty-one billion, five hundred twenty-two million, five hundred thirty-one thousand, four hundred one".