221001221112 has 128 divisors (see below), whose sum is σ = 676693785600. Its totient is φ = 58765436928.

The previous prime is 221001221099. The next prime is 221001221159. The reversal of 221001221112 is 211122100122.

It is a super-2 number, since 2×221001221112² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221001221091 and 221001221100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 629937 + ... + 915872.

It is an arithmetic number, because the mean of its divisors is an integer number (5286670200).

Almost surely, 2^221001221112 is an apocalyptic number.

It is an amenable number.

221001221112 is an abundant number, since it is smaller than the sum of its proper divisors (455692564488).

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

221001221112 is a wasteful number, since it uses less digits than its factorization.

221001221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545885 (or 1545881 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221001221112 its reverse (211122100122), we get a palindrome (432123321234).

The spelling of 221001221112 in words is "two hundred twenty-one billion, one million, two hundred twenty-one thousand, one hundred twelve".