221221210212112 has 40 divisors (see below), whose sum is σ = 475246459815552. Its totient is φ = 98906651356800.

The previous prime is 221221210212077. The next prime is 221221210212127. The reversal of 221221210212112 is 211212012122122.

It is a super-2 number, since 2×221221210212112² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10302765448 + ... + 10302786919.

Almost surely, 2^{221221210212112} is an apocalyptic number.

221221210212112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221221210212112 is an abundant number, since it is smaller than the sum of its proper divisors (254025249603440).

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

221221210212112 is a wasteful number, since it uses less digits than its factorization.

221221210212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20605552447 (or 20605552441 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221221210212112 its reverse (211212012122122), we get a palindrome (432433222334234).

The spelling of 221221210212112 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, one hundred twelve".