221137845 has 8 divisors (see below), whose sum is σ = 353820576. Its totient is φ = 117940176.

The previous prime is 221137843. The next prime is 221137877. The reversal of 221137845 is 548731122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221137845 - 2¹ = 221137843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221137843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7371247 + ... + 7371276.

It is an arithmetic number, because the mean of its divisors is an integer number (44227572).

Almost surely, 2^221137845 is an apocalyptic number.

It is an amenable number.

221137845 is a deficient number, since it is larger than the sum of its proper divisors (132682731).

221137845 is a wasteful number, since it uses less digits than its factorization.

221137845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14742531.

The product of its digits is 13440, while the sum is 33.

The square root of 221137845 is about 14870.7042536660. The cubic root of 221137845 is about 604.7200352998.

Adding to 221137845 its reverse (548731122), we get a palindrome (769868967).

The spelling of 221137845 in words is "two hundred twenty-one million, one hundred thirty-seven thousand, eight hundred forty-five".