121020002221 has 4 divisors (see below), whose sum is σ = 126281741472. Its totient is φ = 115758262972.

The previous prime is 121020002189. The next prime is 121020002231. The reversal of 121020002221 is 122200020121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121020002221 - 2⁵ = 121020002189 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 (121020002231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2630869591 + ... + 2630869636.

It is an arithmetic number, because the mean of its divisors is an integer number (31570435368).

Almost surely, 2^121020002221 is an apocalyptic number.

It is an amenable number.

121020002221 is a deficient number, since it is larger than the sum of its proper divisors (5261739251).

121020002221 is an equidigital number, since it uses as much as digits as its factorization.

121020002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261739250.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121020002221 its reverse (122200020121), we get a palindrome (243220022342).

The spelling of 121020002221 in words is "one hundred twenty-one billion, twenty million, two thousand, two hundred twenty-one".