21012222222 has 12 divisors (see below), whose sum is σ = 45526481520. Its totient is φ = 7004074068.

The previous prime is 21012222221. The next prime is 21012222239. The reversal of 21012222222 is 22222221012.

21012222222 is a `hidden beast` number, since 210 + 12 + 222 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1167345679 = 21012222222 / (2 + 1 + 0 + 1 + 2 + 2 + 2 + 2 + 2 + 2 + 2).

21012222222 is a modest number, since divided by 222222 gives 21012 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21012222195 and 21012222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012222221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583672822 + ... + 583672857.

It is an arithmetic number, because the mean of its divisors is an integer number (3793873460).

Almost surely, 2^21012222222 is an apocalyptic number.

21012222222 is an abundant number, since it is smaller than the sum of its proper divisors (24514259298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012222222 is a wasteful number, since it uses less digits than its factorization.

21012222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167345687 (or 1167345684 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21012222222 its reverse (22222221012), we get a palindrome (43234443234).

The spelling of 21012222222 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-two".