221072613 has 4 divisors (see below), whose sum is σ = 294763488. Its totient is φ = 147381740.

The previous prime is 221072591. The next prime is 221072651. The reversal of 221072613 is 316270122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221072613 - 2⁹ = 221072101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221072513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36845433 + ... + 36845438.

It is an arithmetic number, because the mean of its divisors is an integer number (73690872).

Almost surely, 2^221072613 is an apocalyptic number.

It is an amenable number.

221072613 is a deficient number, since it is larger than the sum of its proper divisors (73690875).

221072613 is an equidigital number, since it uses as much as digits as its factorization.

221072613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73690874.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 221072613 is about 14868.5107862220. The cubic root of 221072613 is about 604.6605686555.

The spelling of 221072613 in words is "two hundred twenty-one million, seventy-two thousand, six hundred thirteen".