21100212122 has 16 divisors (see below), whose sum is σ = 34621713792. Its totient is φ = 9564868320.

The previous prime is 21100212083. The next prime is 21100212131. The reversal of 21100212122 is 22121200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100212097 and 21100212106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1298603 + ... + 1314750.

It is an arithmetic number, because the mean of its divisors is an integer number (2163857112).

Almost surely, 2^21100212122 is an apocalyptic number.

21100212122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21100212122 is a deficient number, since it is larger than the sum of its proper divisors (13521501670).

21100212122 is a wasteful number, since it uses less digits than its factorization.

21100212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613733.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21100212122 its reverse (22121200112), we get a palindrome (43221412234).

The spelling of 21100212122 in words is "twenty-one billion, one hundred million, two hundred twelve thousand, one hundred twenty-two".