21222113555 has 16 divisors (see below), whose sum is σ = 26824262400. Its totient is φ = 16073699040.

The previous prime is 21222113533. The next prime is 21222113581. The reversal of 21222113555 is 55531122212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21222113555 is a prime.

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, 76460 + ... + 219750.

It is an arithmetic number, because the mean of its divisors is an integer number (1676516400).

Almost surely, 2^21222113555 is an apocalyptic number.

21222113555 is a deficient number, since it is larger than the sum of its proper divisors (5602148845).

21222113555 is a wasteful number, since it uses less digits than its factorization.

21222113555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144874.

The product of its digits is 6000, while the sum is 29.

Adding to 21222113555 its reverse (55531122212), we get a palindrome (76753235767).

The spelling of 21222113555 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirteen thousand, five hundred fifty-five".