242635621 has 4 divisors (see below), whose sum is σ = 242668000. Its totient is φ = 242603244.

The previous prime is 242635607. The next prime is 242635637. The reversal of 242635621 is 126536242.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 242635621 - 2¹⁵ = 242602853 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 (242635651) 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, 1480 + ... + 22078.

It is an arithmetic number, because the mean of its divisors is an integer number (60667000).

Almost surely, 2^242635621 is an apocalyptic number.

It is an amenable number.

242635621 is a deficient number, since it is larger than the sum of its proper divisors (32379).

242635621 is a wasteful number, since it uses less digits than its factorization.

242635621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32378.

The product of its digits is 17280, while the sum is 31.

The square root of 242635621 is about 15576.7654216143. The cubic root of 242635621 is about 623.7130818856.

The spelling of 242635621 in words is "two hundred forty-two million, six hundred thirty-five thousand, six hundred twenty-one".