221725497 has 64 divisors (see below), whose sum is σ = 381726720. Its totient is φ = 111538944.

The previous prime is 221725457. The next prime is 221725513. The reversal of 221725497 is 794527122.

It is not a de Polignac number, because 221725497 - 2⁷ = 221725369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221725457) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339223 + ... + 339875.

It is an arithmetic number, because the mean of its divisors is an integer number (5964480).

Almost surely, 2^221725497 is an apocalyptic number.

It is an amenable number.

221725497 is a deficient number, since it is larger than the sum of its proper divisors (160001223).

221725497 is a wasteful number, since it uses less digits than its factorization.

221725497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742.

The product of its digits is 70560, while the sum is 39.

The square root of 221725497 is about 14890.4498588861. The cubic root of 221725497 is about 605.2552227823.

It can be divided in two parts, 221725 and 497, that added together give a palindrome (222222).

The spelling of 221725497 in words is "two hundred twenty-one million, seven hundred twenty-five thousand, four hundred ninety-seven".