221121012 has 48 divisors (see below), whose sum is σ = 620695040. Its totient is φ = 59851872.

The previous prime is 221120983. The next prime is 221121013. The reversal of 221121012 is 210121122.

221121012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121013) 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, 67678 + ... + 70869.

Almost surely, 2^221121012 is an apocalyptic number.

It is an amenable number.

221121012 is an abundant number, since it is smaller than the sum of its proper divisors (399574028).

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

221121012 is a wasteful number, since it uses less digits than its factorization.

221121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138580 (or 138578 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 221121012 is about 14870.1382643202. The cubic root of 221121012 is about 604.7046911591.

Adding to 221121012 its reverse (210121122), we get a palindrome (431242134).

The spelling of 221121012 in words is "two hundred twenty-one million, one hundred twenty-one thousand, twelve".