4242242021 has 4 divisors (see below), whose sum is σ = 4242452544. Its totient is φ = 4242031500.

The previous prime is 4242242009. The next prime is 4242242029. The reversal of 4242242021 is 1202422424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4242242021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4242242029) 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, 71405 + ... + 116546.

It is an arithmetic number, because the mean of its divisors is an integer number (1060613136).

Almost surely, 2^4242242021 is an apocalyptic number.

It is an amenable number.

4242242021 is a deficient number, since it is larger than the sum of its proper divisors (210523).

4242242021 is a wasteful number, since it uses less digits than its factorization.

4242242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210522.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 4242242021 is about 65132.4958910681. The cubic root of 4242242021 is about 1618.8196987406.

Adding to 4242242021 its reverse (1202422424), we get a palindrome (5444664445).

The spelling of 4242242021 in words is "four billion, two hundred forty-two million, two hundred forty-two thousand, twenty-one".