221340957 has 4 divisors (see below), whose sum is σ = 295121280. Its totient is φ = 147560636.

The previous prime is 221340947. The next prime is 221340967. The reversal of 221340957 is 759043122.

221340957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (221340947) and next prime (221340967).

It is a cyclic number.

It is not a de Polignac number, because 221340957 - 2⁶ = 221340893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221340947) 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, 36890157 + ... + 36890162.

It is an arithmetic number, because the mean of its divisors is an integer number (73780320).

Almost surely, 2^221340957 is an apocalyptic number.

It is an amenable number.

221340957 is a deficient number, since it is larger than the sum of its proper divisors (73780323).

221340957 is an equidigital number, since it uses as much as digits as its factorization.

221340957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73780322.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 221340957 is about 14877.5319525787. The cubic root of 221340957 is about 604.9051209272.

The spelling of 221340957 in words is "two hundred twenty-one million, three hundred forty thousand, nine hundred fifty-seven".