242612621 has 4 divisors (see below), whose sum is σ = 248530044. Its totient is φ = 236695200.

The previous prime is 242612611. The next prime is 242612647. The reversal of 242612621 is 126216242.

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 8094025 + 234518596 = 2845^2 + 15314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242612621 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 (242612611) 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, 2958650 + ... + 2958731.

It is an arithmetic number, because the mean of its divisors is an integer number (62132511).

Almost surely, 2^242612621 is an apocalyptic number.

It is an amenable number.

242612621 is a deficient number, since it is larger than the sum of its proper divisors (5917423).

242612621 is an equidigital number, since it uses as much as digits as its factorization.

242612621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917422.

The product of its digits is 2304, while the sum is 26.

The square root of 242612621 is about 15576.0271250406. The cubic root of 242612621 is about 623.6933735205.

Adding to 242612621 its reverse (126216242), we get a palindrome (368828863).

The spelling of 242612621 in words is "two hundred forty-two million, six hundred twelve thousand, six hundred twenty-one".