21122144255 has 16 divisors (see below), whose sum is σ = 25786736640. Its totient is φ = 16604508192.

The previous prime is 21122144249. The next prime is 21122144293. The reversal of 21122144255 is 55244122112.

It is a cyclic number.

It is not a de Polignac number, because 21122144255 - 2⁶ = 21122144191 is a prime.

It is a super-2 number, since 2×21122144255² (a number of 21 digits) contains 22 as substring.

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, 779342 + ... + 805988.

It is an arithmetic number, because the mean of its divisors is an integer number (1611671040).

Almost surely, 2^21122144255 is an apocalyptic number.

21122144255 is a deficient number, since it is larger than the sum of its proper divisors (4664592385).

21122144255 is a wasteful number, since it uses less digits than its factorization.

21122144255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29398.

The product of its digits is 6400, while the sum is 29.

Adding to 21122144255 its reverse (55244122112), we get a palindrome (76366266367).

The spelling of 21122144255 in words is "twenty-one billion, one hundred twenty-two million, one hundred forty-four thousand, two hundred fifty-five".