242404121021 has 4 divisors (see below), whose sum is σ = 242566919100. Its totient is φ = 242241322944.

The previous prime is 242404121009. The next prime is 242404121051. The reversal of 242404121021 is 120121404242.

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 71740944025 + 170663176996 = 267845^2 + 413114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242404121021 is a prime.

It is a super-2 number, since 2×242404121021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242404121051) 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, 81396806 + ... + 81399783.

It is an arithmetic number, because the mean of its divisors is an integer number (60641729775).

Almost surely, 2^242404121021 is an apocalyptic number.

It is an amenable number.

242404121021 is a deficient number, since it is larger than the sum of its proper divisors (162798079).

242404121021 is a wasteful number, since it uses less digits than its factorization.

242404121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162798078.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 242404121021 its reverse (120121404242), we get a palindrome (362525525263).

The spelling of 242404121021 in words is "two hundred forty-two billion, four hundred four million, one hundred twenty-one thousand, twenty-one".