121001220121 has 4 divisors (see below), whose sum is σ = 121011397632. Its totient is φ = 120991042612.

The previous prime is 121001220113. The next prime is 121001220169. The reversal of 121001220121 is 121022100121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121022100121 = 13 ⋅9309392317.

It is a cyclic number.

It is not a de Polignac number, because 121001220121 - 2³ = 121001220113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121001220181) 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, 5070901 + ... + 5094706.

It is an arithmetic number, because the mean of its divisors is an integer number (30252849408).

Almost surely, 2^121001220121 is an apocalyptic number.

It is an amenable number.

121001220121 is a deficient number, since it is larger than the sum of its proper divisors (10177511).

121001220121 is a wasteful number, since it uses less digits than its factorization.

121001220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10177510.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121001220121 its reverse (121022100121), we get a palindrome (242023320242).

The spelling of 121001220121 in words is "one hundred twenty-one billion, one million, two hundred twenty thousand, one hundred twenty-one".