242121021 has 24 divisors (see below), whose sum is σ = 346590720. Its totient is φ = 150300672.

The previous prime is 242121001. The next prime is 242121041. The reversal of 242121021 is 120121242.

It is an interprime number because it is at equal distance from previous prime (242121001) and next prime (242121041).

It is not a de Polignac number, because 242121021 - 2¹¹ = 242118973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242121001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82660 + ... + 85538.

It is an arithmetic number, because the mean of its divisors is an integer number (14441280).

Almost surely, 2^242121021 is an apocalyptic number.

It is an amenable number.

242121021 is a deficient number, since it is larger than the sum of its proper divisors (104469699).

242121021 is a wasteful number, since it uses less digits than its factorization.

242121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013 (or 2996 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 242121021 is about 15560.2384621830. The cubic root of 242121021 is about 623.2718304791.

Adding to 242121021 its reverse (120121242), we get a palindrome (362242263).

The spelling of 242121021 in words is "two hundred forty-two million, one hundred twenty-one thousand, twenty-one".