221157970 has 16 divisors (see below), whose sum is σ = 434274048. Its totient is φ = 80421040.

The previous prime is 221157961. The next prime is 221157997. The reversal of 221157970 is 79751122.

221157970 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005154 + ... + 1005373.

It is an arithmetic number, because the mean of its divisors is an integer number (27142128).

Almost surely, 2^221157970 is an apocalyptic number.

221157970 is a deficient number, since it is larger than the sum of its proper divisors (213116078).

221157970 is a wasteful number, since it uses less digits than its factorization.

221157970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010545.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 221157970 is about 14871.3809042738. The cubic root of 221157970 is about 604.7383792450.

The spelling of 221157970 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, nine hundred seventy".