121000002221 has 24 divisors (see below), whose sum is σ = 141315508224. Its totient is φ = 101484109440.

The previous prime is 121000002199. The next prime is 121000002223. The reversal of 121000002221 is 122200000121.

It is a happy number.

It is not a de Polignac number, because 121000002221 - 2²⁶ = 120932893357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000002223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4724711 + ... + 4750251.

It is an arithmetic number, because the mean of its divisors is an integer number (5888146176).

Almost surely, 2^121000002221 is an apocalyptic number.

It is an amenable number.

121000002221 is a deficient number, since it is larger than the sum of its proper divisors (20315506003).

121000002221 is an equidigital number, since it uses as much as digits as its factorization.

121000002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25821 (or 25748 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121000002221 its reverse (122200000121), we get a palindrome (243200002342).

The spelling of 121000002221 in words is "one hundred twenty-one billion, two thousand, two hundred twenty-one".