221157770 has 24 divisors (see below), whose sum is σ = 412300044. Its totient is φ = 85409408.

The previous prime is 221157721. The next prime is 221157779. The reversal of 221157770 is 77751122.

221157770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 97436641 + 123721129 = 9871^2 + 11123^2 .

It is not an unprimeable number, because it can be changed into a prime (221157779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4739 + ... + 21558.

Almost surely, 2^221157770 is an apocalyptic number.

221157770 is a deficient number, since it is larger than the sum of its proper divisors (191142274).

221157770 is a wasteful number, since it uses less digits than its factorization.

221157770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26362 (or 26333 counting only the distinct ones).

The product of its (nonzero) digits is 6860, while the sum is 32.

The square root of 221157770 is about 14871.3741799472. The cubic root of 221157770 is about 604.7381969504.

The spelling of 221157770 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, seven hundred seventy".