221002121112 has 64 divisors (see below), whose sum is σ = 563393107200. Its totient is φ = 72223539840.

The previous prime is 221002121071. The next prime is 221002121129. The reversal of 221002121112 is 211121200122.

It is a super-2 number, since 2×221002121112² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221002121091 and 221002121100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203589 + ... + 695307.

It is an arithmetic number, because the mean of its divisors is an integer number (8803017300).

Almost surely, 2^221002121112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221002121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281696553600).

221002121112 is an abundant number, since it is smaller than the sum of its proper divisors (342390986088).

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

221002121112 is a wasteful number, since it uses less digits than its factorization.

221002121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492096 (or 492092 counting only the distinct ones).

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

Adding to 221002121112 its reverse (211121200122), we get a palindrome (432123321234).

The spelling of 221002121112 in words is "two hundred twenty-one billion, two million, one hundred twenty-one thousand, one hundred twelve".