121220233021 has 4 divisors (see below), whose sum is σ = 121281058012. Its totient is φ = 121159408032.

The previous prime is 121220233019. The next prime is 121220233049. The reversal of 121220233021 is 120332022121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89603836921 + 31616396100 = 299339^2 + 177810^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220233021 - 2¹ = 121220233019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220233021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220233051) 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, 30409506 + ... + 30413491.

It is an arithmetic number, because the mean of its divisors is an integer number (30320264503).

Almost surely, 2^121220233021 is an apocalyptic number.

It is an amenable number.

121220233021 is a deficient number, since it is larger than the sum of its proper divisors (60824991).

121220233021 is an equidigital number, since it uses as much as digits as its factorization.

121220233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60824990.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 121220233021 its reverse (120332022121), we get a palindrome (241552255142).

The spelling of 121220233021 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred thirty-three thousand, twenty-one".