221121101012 has 48 divisors (see below), whose sum is σ = 444647669760. Its totient is φ = 94251542112.

The previous prime is 221121101011. The next prime is 221121101057. The reversal of 221121101012 is 210101121122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121101011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6770939 + ... + 6803517.

It is an arithmetic number, because the mean of its divisors is an integer number (9263493120).

Almost surely, 2^221121101012 is an apocalyptic number.

It is an amenable number.

221121101012 is an abundant number, since it is smaller than the sum of its proper divisors (223526568748).

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

221121101012 is a wasteful number, since it uses less digits than its factorization.

221121101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33900 (or 33898 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221121101012 its reverse (210101121122), we get a palindrome (431222222134).

The spelling of 221121101012 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, twelve".