242522021 has 48 divisors (see below), whose sum is σ = 308183040. Its totient is φ = 189876960.

The previous prime is 242522009. The next prime is 242522029. The reversal of 242522021 is 120225242.

It is not a de Polignac number, because 242522021 - 2²² = 238327717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242521984 and 242522002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242522029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3069860 + ... + 3069938.

It is an arithmetic number, because the mean of its divisors is an integer number (6420480).

Almost surely, 2^242522021 is an apocalyptic number.

It is an amenable number.

242522021 is a deficient number, since it is larger than the sum of its proper divisors (65661019).

242522021 is a wasteful number, since it uses less digits than its factorization.

242522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 242522021 is about 15573.1185380450. The cubic root of 242522021 is about 623.6157275806.

Adding to 242522021 its reverse (120225242), we get a palindrome (362747263).

The spelling of 242522021 in words is "two hundred forty-two million, five hundred twenty-two thousand, twenty-one".