21323442255 has 16 divisors (see below), whose sum is σ = 35600878080. Its totient is φ = 10878045728.

The previous prime is 21323442241. The next prime is 21323442307. The reversal of 21323442255 is 55224432312.

It is a cyclic number.

It is not a de Polignac number, because 21323442255 - 2⁵ = 21323442223 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, 30903195 + ... + 30903884.

It is an arithmetic number, because the mean of its divisors is an integer number (2225054880).

Almost surely, 2^21323442255 is an apocalyptic number.

21323442255 is a deficient number, since it is larger than the sum of its proper divisors (14277435825).

21323442255 is a wasteful number, since it uses less digits than its factorization.

21323442255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61807110.

The product of its digits is 57600, while the sum is 33.

Adding to 21323442255 its reverse (55224432312), we get a palindrome (76547874567).

The spelling of 21323442255 in words is "twenty-one billion, three hundred twenty-three million, four hundred forty-two thousand, two hundred fifty-five".