221356794 has 16 divisors (see below), whose sum is σ = 444315168. Its totient is φ = 73518672.

The previous prime is 221356763. The next prime is 221356799. The reversal of 221356794 is 497653122.

221356794 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221356799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64932 + ... + 68255.

It is an arithmetic number, because the mean of its divisors is an integer number (27769698).

Almost surely, 2^221356794 is an apocalyptic number.

221356794 is an abundant number, since it is smaller than the sum of its proper divisors (222958374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221356794 is a wasteful number, since it uses less digits than its factorization.

221356794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133469.

The product of its digits is 90720, while the sum is 39.

The square root of 221356794 is about 14878.0641885966. The cubic root of 221356794 is about 604.9195476200.

The spelling of 221356794 in words is "two hundred twenty-one million, three hundred fifty-six thousand, seven hundred ninety-four".