221273938 has 16 divisors (see below), whose sum is σ = 366716160. Its totient is φ = 99601216.

The previous prime is 221273929. The next prime is 221273947. The reversal of 221273938 is 839372122.

221273938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221273929) and next prime (221273947).

It is a junction number, because it is equal to n+sod(n) for n = 221273897 and 221273906.

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, 140698 + ... + 142261.

It is an arithmetic number, because the mean of its divisors is an integer number (22919760).

Almost surely, 2^221273938 is an apocalyptic number.

221273938 is a deficient number, since it is larger than the sum of its proper divisors (145442222).

221273938 is a wasteful number, since it uses less digits than its factorization.

221273938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283001.

The product of its digits is 36288, while the sum is 37.

The square root of 221273938 is about 14875.2794259469. The cubic root of 221273938 is about 604.8440624450.

The spelling of 221273938 in words is "two hundred twenty-one million, two hundred seventy-three thousand, nine hundred thirty-eight".