21222110001 has 16 divisors (see below), whose sum is σ = 28747490688. Its totient is φ = 13924080000.

The previous prime is 21222109973. The next prime is 21222110003. The reversal of 21222110001 is 10001122212.

It is not a de Polignac number, because 21222110001 - 2⁷ = 21222109873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222110003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159100 + ... + 260301.

It is an arithmetic number, because the mean of its divisors is an integer number (1796718168).

Almost surely, 2^21222110001 is an apocalyptic number.

It is an amenable number.

21222110001 is a deficient number, since it is larger than the sum of its proper divisors (7525380687).

21222110001 is a wasteful number, since it uses less digits than its factorization.

21222110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419672.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21222110001 its reverse (10001122212), we get a palindrome (31223232213).

It can be divided in two parts, 212221 and 10001, that added together give a palindrome (222222).

The spelling of 21222110001 in words is "twenty-one billion, two hundred twenty-two million, one hundred ten thousand, one".