21222224321255 has 16 divisors (see below), whose sum is σ = 25825619432448. Its totient is φ = 16738484196000.

The previous prime is 21222224321159. The next prime is 21222224321267. The reversal of 21222224321255 is 55212342222212.

It is a happy number.

21222224321255 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 21222224321255 - 2²⁴ = 21222207544039 is a prime.

It is a Duffinian number.

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, 42961820 + ... + 43452990.

It is an arithmetic number, because the mean of its divisors is an integer number (1614101214528).

Almost surely, 2^{21222224321255} is an apocalyptic number.

21222224321255 is a deficient number, since it is larger than the sum of its proper divisors (4603395111193).

21222224321255 is a wasteful number, since it uses less digits than its factorization.

21222224321255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612958.

The product of its digits is 76800, while the sum is 35.

Adding to 21222224321255 its reverse (55212342222212), we get a palindrome (76434566543467).

The spelling of 21222224321255 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-four million, three hundred twenty-one thousand, two hundred fifty-five".