221215107 has 16 divisors (see below), whose sum is σ = 298995840. Its totient is φ = 145464000.

The previous prime is 221215073. The next prime is 221215129. The reversal of 221215107 is 701512122.

It is not a de Polignac number, because 221215107 - 2⁷ = 221214979 is a prime.

It is a super-2 number, since 2×221215107² = 97872247130042898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221215187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151732 + ... + 153182.

It is an arithmetic number, because the mean of its divisors is an integer number (18687240).

Almost surely, 2^221215107 is an apocalyptic number.

221215107 is a deficient number, since it is larger than the sum of its proper divisors (77780733).

221215107 is a wasteful number, since it uses less digits than its factorization.

221215107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 221215107 is about 14873.3018190313. The cubic root of 221215107 is about 604.7904535784.

Adding to 221215107 its reverse (701512122), we get a palindrome (922727229).

The spelling of 221215107 in words is "two hundred twenty-one million, two hundred fifteen thousand, one hundred seven".