121444021 has 4 divisors (see below), whose sum is σ = 121466700. Its totient is φ = 121421344.

The previous prime is 121444013. The next prime is 121444033. The reversal of 121444021 is 120444121.

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 75881521 + 45562500 = 8711^2 + 6750^2 .

It is a cyclic number.

It is not a de Polignac number, because 121444021 - 2³ = 121444013 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 121444021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121444051) 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, 1665 + ... + 15673.

It is an arithmetic number, because the mean of its divisors is an integer number (30366675).

Almost surely, 2^121444021 is an apocalyptic number.

It is an amenable number.

121444021 is a deficient number, since it is larger than the sum of its proper divisors (22679).

121444021 is an equidigital number, since it uses as much as digits as its factorization.

121444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22678.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 121444021 is about 11020.1642909713. The cubic root of 121444021 is about 495.2130103878.

Adding to 121444021 its reverse (120444121), we get a palindrome (241888142).

It can be divided in two parts, 1214440 and 21, that added together give a triangular number (1214461 = T₁₅₅₈).

The spelling of 121444021 in words is "one hundred twenty-one million, four hundred forty-four thousand, twenty-one".