221420045 has 32 divisors (see below), whose sum is σ = 332881920. Its totient is φ = 137355840.

The previous prime is 221420041. The next prime is 221420051. The reversal of 221420045 is 540024122.

It is a happy number.

It is not a de Polignac number, because 221420045 - 2² = 221420041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221419999 and 221420026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221420041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84566 + ... + 87144.

It is an arithmetic number, because the mean of its divisors is an integer number (10402560).

Almost surely, 2^221420045 is an apocalyptic number.

It is an amenable number.

221420045 is a deficient number, since it is larger than the sum of its proper divisors (111461875).

221420045 is a wasteful number, since it uses less digits than its factorization.

221420045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 221420045 is about 14880.1896829308. The cubic root of 221420045 is about 604.9771591677.

Adding to 221420045 its reverse (540024122), we get a palindrome (761444167).

The spelling of 221420045 in words is "two hundred twenty-one million, four hundred twenty thousand, forty-five".