221245115 has 32 divisors (see below), whose sum is σ = 331287936. Its totient is φ = 138101760.

The previous prime is 221245111. The next prime is 221245117. The reversal of 221245115 is 511542122.

221245115 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 221245115 - 2² = 221245111 is a prime.

It is a super-2 number, since 2×221245115² = 97898801822726450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221245111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29885 + ... + 36545.

It is an arithmetic number, because the mean of its divisors is an integer number (10352748).

Almost surely, 2^221245115 is an apocalyptic number.

221245115 is a deficient number, since it is larger than the sum of its proper divisors (110042821).

221245115 is a wasteful number, since it uses less digits than its factorization.

221245115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6759.

The product of its digits is 800, while the sum is 23.

The square root of 221245115 is about 14874.3105722585. The cubic root of 221245115 is about 604.8177991059.

Adding to 221245115 its reverse (511542122), we get a palindrome (732787237).

The spelling of 221245115 in words is "two hundred twenty-one million, two hundred forty-five thousand, one hundred fifteen".