221072170 has 16 divisors (see below), whose sum is σ = 434105568. Its totient is φ = 80389840.

The previous prime is 221072167. The next prime is 221072197. The reversal of 221072170 is 71270122.

221072170 = T₄₆₆ + T₄₆₇ + ... + T₁₁₂₅.

221072170 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 1004764 + ... + 1004983.

It is an arithmetic number, because the mean of its divisors is an integer number (27131598).

Almost surely, 2^221072170 is an apocalyptic number.

221072170 is a deficient number, since it is larger than the sum of its proper divisors (213033398).

221072170 is a wasteful number, since it uses less digits than its factorization.

221072170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009765.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 221072170 is about 14868.4958889593. The cubic root of 221072170 is about 604.6601647689.

The spelling of 221072170 in words is "two hundred twenty-one million, seventy-two thousand, one hundred seventy".