221013012 has 48 divisors (see below), whose sum is σ = 580737024. Its totient is φ = 64812000.

The previous prime is 221013011. The next prime is 221013017. The reversal of 221013012 is 210310122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221013011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22914 + ... + 31097.

It is an arithmetic number, because the mean of its divisors is an integer number (12098688).

Almost surely, 2^221013012 is an apocalyptic number.

221013012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221013012 is an abundant number, since it is smaller than the sum of its proper divisors (359724012).

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

221013012 is a wasteful number, since it uses less digits than its factorization.

221013012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54060 (or 54058 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221013012 is about 14866.5063817966. The cubic root of 221013012 is about 604.6062251026.

Adding to 221013012 its reverse (210310122), we get a palindrome (431323134).

The spelling of 221013012 in words is "two hundred twenty-one million, thirteen thousand, twelve".