242122254221 has 4 divisors (see below), whose sum is σ = 250471297500. Its totient is φ = 233773210944.

The previous prime is 242122254217. The next prime is 242122254223. The reversal of 242122254221 is 122452221242.

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 55486158025 + 186636096196 = 235555^2 + 432014^2 .

It is a cyclic number.

It is not a de Polignac number, because 242122254221 - 2² = 242122254217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 8349043249 = 242122254221 / (2 + 4 + 2 + 1 + 2 + 2 + 2 + 5 + 4 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242122254223) 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, 4174521596 + ... + 4174521653.

It is an arithmetic number, because the mean of its divisors is an integer number (62617824375).

Almost surely, 2^242122254221 is an apocalyptic number.

It is an amenable number.

242122254221 is a deficient number, since it is larger than the sum of its proper divisors (8349043279).

242122254221 is an equidigital number, since it uses as much as digits as its factorization.

242122254221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8349043278.

The product of its digits is 10240, while the sum is 29.

Adding to 242122254221 its reverse (122452221242), we get a palindrome (364574475463).

The spelling of 242122254221 in words is "two hundred forty-two billion, one hundred twenty-two million, two hundred fifty-four thousand, two hundred twenty-one".