221013915 has 16 divisors (see below), whose sum is σ = 353817600. Its totient is φ = 117808992.

The previous prime is 221013907. The next prime is 221013917. The reversal of 221013915 is 519310122.

It is not a de Polignac number, because 221013915 - 2³ = 221013907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221013917) 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, 38076 + ... + 43494.

It is an arithmetic number, because the mean of its divisors is an integer number (22113600).

Almost surely, 2^221013915 is an apocalyptic number.

221013915 is a deficient number, since it is larger than the sum of its proper divisors (132803685).

221013915 is a wasteful number, since it uses less digits than its factorization.

221013915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8146.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 221013915 is about 14866.5367520482. The cubic root of 221013915 is about 604.6070485212.

The spelling of 221013915 in words is "two hundred twenty-one million, thirteen thousand, nine hundred fifteen".