221947349 has 32 divisors (see below), whose sum is σ = 255257856. Its totient is φ = 191600640.

The previous prime is 221947343. The next prime is 221947357. The reversal of 221947349 is 943749122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221947349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221947343) 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, 2288069 + ... + 2288165.

It is an arithmetic number, because the mean of its divisors is an integer number (7976808).

Almost surely, 2^221947349 is an apocalyptic number.

It is an amenable number.

221947349 is a deficient number, since it is larger than the sum of its proper divisors (33310507).

221947349 is a wasteful number, since it uses less digits than its factorization.

221947349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its digits is 108864, while the sum is 41.

The square root of 221947349 is about 14897.8974691062. The cubic root of 221947349 is about 605.4570223405.

The spelling of 221947349 in words is "two hundred twenty-one million, nine hundred forty-seven thousand, three hundred forty-nine".