242121199 has 4 divisors (see below), whose sum is σ = 254864440. Its totient is φ = 229377960.

The previous prime is 242121197. The next prime is 242121211. The reversal of 242121199 is 991121242.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 242121199 - 2¹ = 242121197 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 242121199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242121197) 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, 6371592 + ... + 6371629.

It is an arithmetic number, because the mean of its divisors is an integer number (63716110).

Almost surely, 2^242121199 is an apocalyptic number.

242121199 is a deficient number, since it is larger than the sum of its proper divisors (12743241).

242121199 is a wasteful number, since it uses less digits than its factorization.

242121199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12743240.

The product of its digits is 2592, while the sum is 31.

The square root of 242121199 is about 15560.2441818887. The cubic root of 242121199 is about 623.2719832159.

The spelling of 242121199 in words is "two hundred forty-two million, one hundred twenty-one thousand, one hundred ninety-nine".