21112012222 has 32 divisors (see below), whose sum is σ = 38185056000. Its totient is φ = 8551951488.

The previous prime is 21112012217. The next prime is 21112012253. The reversal of 21112012222 is 22221021112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112012196 and 21112012205.

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, 23529 + ... + 206827.

It is an arithmetic number, because the mean of its divisors is an integer number (1193283000).

Almost surely, 2^21112012222 is an apocalyptic number.

21112012222 is a deficient number, since it is larger than the sum of its proper divisors (17073043778).

21112012222 is a wasteful number, since it uses less digits than its factorization.

21112012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183760.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112012222 its reverse (22221021112), we get a palindrome (43333033334).

The spelling of 21112012222 in words is "twenty-one billion, one hundred twelve million, twelve thousand, two hundred twenty-two".