121442424021 has 12 divisors (see below), whose sum is σ = 176969197548. Its totient is φ = 80245140864.

The previous prime is 121442424007. The next prime is 121442424073. The reversal of 121442424021 is 120424244121.

121442424021 is a `hidden beast` number, since 1 + 2 + 14 + 4 + 242 + 402 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8324555121 + 113117868900 = 91239^2 + 336330^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121442424021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121442424121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59705190 + ... + 59707223.

It is an arithmetic number, because the mean of its divisors is an integer number (14747433129).

Almost surely, 2^121442424021 is an apocalyptic number.

It is an amenable number.

121442424021 is a deficient number, since it is larger than the sum of its proper divisors (55526773527).

121442424021 is a wasteful number, since it uses less digits than its factorization.

121442424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119412532 (or 119412529 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 121442424021 its reverse (120424244121), we get a palindrome (241866668142).

The spelling of 121442424021 in words is "one hundred twenty-one billion, four hundred forty-two million, four hundred twenty-four thousand, twenty-one".