221012312 has 16 divisors (see below), whose sum is σ = 414590400. Its totient is φ = 110454880.

The previous prime is 221012273. The next prime is 221012321. The reversal of 221012312 is 213210122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16889 + ... + 26967.

It is an arithmetic number, because the mean of its divisors is an integer number (25911900).

Almost surely, 2^221012312 is an apocalyptic number.

It is an amenable number.

221012312 is a deficient number, since it is larger than the sum of its proper divisors (193578088).

221012312 is a wasteful number, since it uses less digits than its factorization.

221012312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12826 (or 12822 counting only the distinct ones).

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

The square root of 221012312 is about 14866.4828389233. The cubic root of 221012312 is about 604.6055867921.

Adding to 221012312 its reverse (213210122), we get a palindrome (434222434).

The spelling of 221012312 in words is "two hundred twenty-one million, twelve thousand, three hundred twelve".