221221222110012 has 24 divisors (see below), whose sum is σ = 517408939135312. Its totient is φ = 73565252006400.

The previous prime is 221221222109957. The next prime is 221221222110029. The reversal of 221221222110012 is 210011222122122.

It is a super-2 number, since 2×221221222110012² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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, 21894415189 + ... + 21894425292.

Almost surely, 2^{221221222110012} is an apocalyptic number.

It is an amenable number.

221221222110012 is an abundant number, since it is smaller than the sum of its proper divisors (296187717025300).

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

221221222110012 is a wasteful number, since it uses less digits than its factorization.

221221222110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43788840909 (or 43788840907 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221221222110012 its reverse (210011222122122), we get a palindrome (431232444232134).

The spelling of 221221222110012 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred ten thousand, twelve".