221138192 has 40 divisors (see below), whose sum is σ = 487736640. Its totient is φ = 96145280.

The previous prime is 221138171. The next prime is 221138209. The reversal of 221138192 is 291831122.

It is a super-2 number, since 2×221138192² = 97804199922057728, which contains 22 as substring.

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, 23267 + ... + 31362.

It is an arithmetic number, because the mean of its divisors is an integer number (12193416).

Almost surely, 2^221138192 is an apocalyptic number.

221138192 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221138192 is an abundant number, since it is smaller than the sum of its proper divisors (266598448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221138192 is a wasteful number, since it uses less digits than its factorization.

221138192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54671 (or 54665 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 221138192 is about 14870.7159208963. The cubic root of 221138192 is about 604.7203515999.

The spelling of 221138192 in words is "two hundred twenty-one million, one hundred thirty-eight thousand, one hundred ninety-two".