21400122222 has 12 divisors (see below), whose sum is σ = 46366931520. Its totient is φ = 7133374068.

The previous prime is 21400122187. The next prime is 21400122239. The reversal of 21400122222 is 22222100412.

21400122222 is a `hidden beast` number, since 21 + 400 + 1 + 22 + 222 = 666.

It is a super-2 number, since 2×21400122222² (a number of 21 digits) contains 22 as substring.

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: 1188895679 = 21400122222 / (2 + 1 + 4 + 0 + 0 + 1 + 2 + 2 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21400122195 and 21400122204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594447822 + ... + 594447857.

It is an arithmetic number, because the mean of its divisors is an integer number (3863910960).

Almost surely, 2^21400122222 is an apocalyptic number.

21400122222 is an abundant number, since it is smaller than the sum of its proper divisors (24966809298).

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

21400122222 is a wasteful number, since it uses less digits than its factorization.

21400122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188895687 (or 1188895684 counting only the distinct ones).

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

Adding to 21400122222 its reverse (22222100412), we get a palindrome (43622222634).

The spelling of 21400122222 in words is "twenty-one billion, four hundred million, one hundred twenty-two thousand, two hundred twenty-two".