221121010012 has 48 divisors (see below), whose sum is σ = 468399697920. Its totient is φ = 89164346112.

The previous prime is 221121010007. The next prime is 221121010021. The reversal of 221121010012 is 210010121122.

It is a junction number, because it is equal to n+sod(n) for n = 221121009974 and 221121010001.

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, 1521789 + ... + 1660747.

It is an arithmetic number, because the mean of its divisors is an integer number (9758327040).

Almost surely, 2^221121010012 is an apocalyptic number.

It is an amenable number.

221121010012 is an abundant number, since it is smaller than the sum of its proper divisors (247278687908).

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

221121010012 is a wasteful number, since it uses less digits than its factorization.

221121010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142330 (or 142328 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221121010012 its reverse (210010121122), we get a palindrome (431131131134).

It can be divided in two parts, 2211210 and 10012, that added together give a palindrome (2221222).

The spelling of 221121010012 in words is "two hundred twenty-one billion, one hundred twenty-one million, ten thousand, twelve".