21326614401 has 4 divisors (see below), whose sum is σ = 28435485872. Its totient is φ = 14217742932.

The previous prime is 21326614399. The next prime is 21326614423. The reversal of 21326614401 is 10441662312.

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 not a de Polignac number, because 21326614401 - 2¹ = 21326614399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21326614481) 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, 3554435731 + ... + 3554435736.

It is an arithmetic number, because the mean of its divisors is an integer number (7108871468).

Almost surely, 2^21326614401 is an apocalyptic number.

It is an amenable number.

21326614401 is a deficient number, since it is larger than the sum of its proper divisors (7108871471).

21326614401 is an equidigital number, since it uses as much as digits as its factorization.

21326614401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108871470.

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21326614401 in words is "twenty-one billion, three hundred twenty-six million, six hundred fourteen thousand, four hundred one".