221946180 has 24 divisors (see below), whose sum is σ = 621449472. Its totient is φ = 59185632.

The previous prime is 221946133. The next prime is 221946181. The reversal of 221946180 is 81649122.

It is not an unprimeable number, because it can be changed into a prime (221946181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849492 + ... + 1849611.

It is an arithmetic number, because the mean of its divisors is an integer number (25893728).

Almost surely, 2^221946180 is an apocalyptic number.

221946180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221946180 is an abundant number, since it is smaller than the sum of its proper divisors (399503292).

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

221946180 is a wasteful number, since it uses less digits than its factorization.

221946180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699115 (or 3699113 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 221946180 is about 14897.8582353303. The cubic root of 221946180 is about 605.4559593549.

The spelling of 221946180 in words is "two hundred twenty-one million, nine hundred forty-six thousand, one hundred eighty".