21242002255 has 16 divisors (see below), whose sum is σ = 25561879200. Its totient is φ = 16946017920.

The previous prime is 21242002237. The next prime is 21242002289. The reversal of 21242002255 is 55220024212.

It is not a de Polignac number, because 21242002255 - 2⁷ = 21242002127 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3162841 + ... + 3169549.

It is an arithmetic number, because the mean of its divisors is an integer number (1597617450).

Almost surely, 2^21242002255 is an apocalyptic number.

21242002255 is a deficient number, since it is larger than the sum of its proper divisors (4319876945).

21242002255 is a wasteful number, since it uses less digits than its factorization.

21242002255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8394.

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 21242002255 its reverse (55220024212), we get a palindrome (76462026467).

The spelling of 21242002255 in words is "twenty-one billion, two hundred forty-two million, two thousand, two hundred fifty-five".