221013291 has 16 divisors (see below), whose sum is σ = 305220608. Its totient is φ = 142106400.

The previous prime is 221013283. The next prime is 221013319. The reversal of 221013291 is 192310122.

221013291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221013291 - 2³ = 221013283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221013251) 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, 24681 + ... + 32421.

It is an arithmetic number, because the mean of its divisors is an integer number (19076288).

Almost surely, 2^221013291 is an apocalyptic number.

221013291 is a deficient number, since it is larger than the sum of its proper divisors (84207317).

221013291 is a wasteful number, since it uses less digits than its factorization.

221013291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8082.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 221013291 is about 14866.5157653029. The cubic root of 221013291 is about 604.6064795146.

The spelling of 221013291 in words is "two hundred twenty-one million, thirteen thousand, two hundred ninety-one".