221023012 has 24 divisors (see below), whose sum is σ = 442386560. Its totient is φ = 94651200.

The previous prime is 221023003. The next prime is 221023013. The reversal of 221023012 is 210320122.

It is a junction number, because it is equal to n+sod(n) for n = 221022983 and 221023001.

It is not an unprimeable number, because it can be changed into a prime (221023013) 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, 50512 + ... + 54712.

Almost surely, 2^221023012 is an apocalyptic number.

It is an amenable number.

221023012 is an abundant number, since it is smaller than the sum of its proper divisors (221363548).

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

221023012 is a wasteful number, since it uses less digits than its factorization.

221023012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091 (or 6089 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221023012 is about 14866.8427044884. The cubic root of 221023012 is about 604.6153436775.

Adding to 221023012 its reverse (210320122), we get a palindrome (431343134).

The spelling of 221023012 in words is "two hundred twenty-one million, twenty-three thousand, twelve".