221745894401 has 4 divisors (see below), whose sum is σ = 221766565332. Its totient is φ = 221725223472.

The previous prime is 221745894313. The next prime is 221745894449. The reversal of 221745894401 is 104498547122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127035216400 + 94710678001 = 356420^2 + 307751^2 .

It is a cyclic number.

It is not a de Polignac number, because 221745894401 - 2¹⁴ = 221745878017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221745894301) 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, 10319366 + ... + 10340831.

It is an arithmetic number, because the mean of its divisors is an integer number (55441641333).

Almost surely, 2^221745894401 is an apocalyptic number.

It is an amenable number.

221745894401 is a deficient number, since it is larger than the sum of its proper divisors (20670931).

221745894401 is a wasteful number, since it uses less digits than its factorization.

221745894401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20670930.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 221745894401 in words is "two hundred twenty-one billion, seven hundred forty-five million, eight hundred ninety-four thousand, four hundred one".