221123012 has 48 divisors (see below), whose sum is σ = 466445952. Its totient is φ = 90478080.

The previous prime is 221123011. The next prime is 221123017. The reversal of 221123012 is 210321122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221123011) 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, 10778 + ... + 23630.

It is an arithmetic number, because the mean of its divisors is an integer number (9717624).

Almost surely, 2^221123012 is an apocalyptic number.

221123012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221123012 is an abundant number, since it is smaller than the sum of its proper divisors (245322940).

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

221123012 is a wasteful number, since it uses less digits than its factorization.

221123012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12908 (or 12906 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221123012 is about 14870.2055130385. The cubic root of 221123012 is about 604.7065143021.

Adding to 221123012 its reverse (210321122), we get a palindrome (431444134).

The spelling of 221123012 in words is "two hundred twenty-one million, one hundred twenty-three thousand, twelve".