21200112122222 has 48 divisors (see below), whose sum is σ = 36775755354240. Its totient is φ = 9087616599600.

The previous prime is 21200112122219. The next prime is 21200112122237. The reversal of 21200112122222 is 22222121100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200112122194 and 21200112122203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12002072 + ... + 13654667.

It is an arithmetic number, because the mean of its divisors is an integer number (766161569880).

Almost surely, 2^{21200112122222} is an apocalyptic number.

21200112122222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21200112122222 is a deficient number, since it is larger than the sum of its proper divisors (15575643232018).

21200112122222 is a wasteful number, since it uses less digits than its factorization.

21200112122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25656869 (or 25656846 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21200112122222 its reverse (22222121100212), we get a palindrome (43422233222434).

The spelling of 21200112122222 in words is "twenty-one trillion, two hundred billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-two".