242620021645 has 16 divisors (see below), whose sum is σ = 291771374400. Its totient is φ = 193677969024.

The previous prime is 242620021601. The next prime is 242620021661. The reversal of 242620021645 is 546120026242.

It is a cyclic number.

It is not a de Polignac number, because 242620021645 - 2¹¹ = 242620019597 is a prime.

It is a super-3 number, since 3×242620021645³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 242620021645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14240622 + ... + 14257648.

It is an arithmetic number, because the mean of its divisors is an integer number (18235710900).

Almost surely, 2^242620021645 is an apocalyptic number.

It is an amenable number.

242620021645 is a deficient number, since it is larger than the sum of its proper divisors (49151352755).

242620021645 is a wasteful number, since it uses less digits than its factorization.

242620021645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23004.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 242620021645 its reverse (546120026242), we get a palindrome (788740047887).

The spelling of 242620021645 in words is "two hundred forty-two billion, six hundred twenty million, twenty-one thousand, six hundred forty-five".