221773930 has 32 divisors (see below), whose sum is σ = 468556416. Its totient is φ = 73980864.

The previous prime is 221773921. The next prime is 221773931. The reversal of 221773930 is 39377122.

It is not an unprimeable number, because it can be changed into a prime (221773931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40224 + ... + 45403.

It is an arithmetic number, because the mean of its divisors is an integer number (14642388).

Almost surely, 2^221773930 is an apocalyptic number.

221773930 is an abundant number, since it is smaller than the sum of its proper divisors (246782486).

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

221773930 is a wasteful number, since it uses less digits than its factorization.

221773930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85678.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 221773930 is about 14892.0760809230. The cubic root of 221773930 is about 605.2992895712.

The spelling of 221773930 in words is "two hundred twenty-one million, seven hundred seventy-three thousand, nine hundred thirty".