221023100 has 36 divisors (see below), whose sum is σ = 500478384. Its totient is φ = 84564480.

The previous prime is 221023097. The next prime is 221023109. The reversal of 221023100 is 1320122.

It is a happy number.

It is a super-2 number, since 2×221023100² = 97702421467220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221023109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45749 + ... + 50348.

Almost surely, 2^221023100 is an apocalyptic number.

221023100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221023100 is an abundant number, since it is smaller than the sum of its proper divisors (279455284).

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

221023100 is a wasteful number, since it uses less digits than its factorization.

221023100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96134 (or 96127 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 221023100 is about 14866.8456640943. The cubic root of 221023100 is about 604.6154239197.

Adding to 221023100 its reverse (1320122), we get a palindrome (222343222).

The spelling of 221023100 in words is "two hundred twenty-one million, twenty-three thousand, one hundred".