121012012221 has 4 divisors (see below), whose sum is σ = 161349349632. Its totient is φ = 80674674812.

The previous prime is 121012012171. The next prime is 121012012241. The reversal of 121012012221 is 122210210121.

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 121012012221 - 2⁹ = 121012011709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121012012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012012241) 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, 20168668701 + ... + 20168668706.

It is an arithmetic number, because the mean of its divisors is an integer number (40337337408).

Almost surely, 2^121012012221 is an apocalyptic number.

It is an amenable number.

121012012221 is a deficient number, since it is larger than the sum of its proper divisors (40337337411).

121012012221 is an equidigital number, since it uses as much as digits as its factorization.

121012012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40337337410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121012012221 its reverse (122210210121), we get a palindrome (243222222342).

The spelling of 121012012221 in words is "one hundred twenty-one billion, twelve million, twelve thousand, two hundred twenty-one".