221565014401 has 4 divisors (see below), whose sum is σ = 222558579712. Its totient is φ = 220571449092.

The previous prime is 221565014369. The next prime is 221565014413. The reversal of 221565014401 is 104410565122.

It is a happy number.

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 221565014401 - 2⁵ = 221565014369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221565014701) 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, 496782321 + ... + 496782766.

It is an arithmetic number, because the mean of its divisors is an integer number (55639644928).

Almost surely, 2^221565014401 is an apocalyptic number.

It is an amenable number.

221565014401 is a deficient number, since it is larger than the sum of its proper divisors (993565311).

221565014401 is an equidigital number, since it uses as much as digits as its factorization.

221565014401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993565310.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 221565014401 its reverse (104410565122), we get a palindrome (325975579523).

The spelling of 221565014401 in words is "two hundred twenty-one billion, five hundred sixty-five million, fourteen thousand, four hundred one".