21222012255 has 64 divisors (see below), whose sum is σ = 36361543680. Its totient is φ = 10543104000.

The previous prime is 21222012223. The next prime is 21222012269. The reversal of 21222012255 is 55221022212.

It is not a de Polignac number, because 21222012255 - 2⁵ = 21222012223 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10876530 + ... + 10878480.

It is an arithmetic number, because the mean of its divisors is an integer number (568149120).

Almost surely, 2^21222012255 is an apocalyptic number.

21222012255 is a deficient number, since it is larger than the sum of its proper divisors (15139531425).

21222012255 is a wasteful number, since it uses less digits than its factorization.

21222012255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792.

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21222012255 its reverse (55221022212), we get a palindrome (76443034467).

The spelling of 21222012255 in words is "twenty-one billion, two hundred twenty-two million, twelve thousand, two hundred fifty-five".