21534222255 has 64 divisors (see below), whose sum is σ = 43003312128. Its totient is φ = 8958942720.

The previous prime is 21534222251. The next prime is 21534222271. The reversal of 21534222255 is 55222243512.

It is not a de Polignac number, because 21534222255 - 2² = 21534222251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534222251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14184 + ... + 208013.

It is an arithmetic number, because the mean of its divisors is an integer number (671926752).

Almost surely, 2^21534222255 is an apocalyptic number.

21534222255 is a deficient number, since it is larger than the sum of its proper divisors (21469089873).

21534222255 is a wasteful number, since it uses less digits than its factorization.

21534222255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222296.

The product of its digits is 48000, while the sum is 33.

Adding to 21534222255 its reverse (55222243512), we get a palindrome (76756465767).

The spelling of 21534222255 in words is "twenty-one billion, five hundred thirty-four million, two hundred twenty-two thousand, two hundred fifty-five".