21001100112122 has 16 divisors (see below), whose sum is σ = 34499851555680. Its totient is φ = 9528530428272.

The previous prime is 21001100112121. The next prime is 21001100112151. The reversal of 21001100112122 is 22121100110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001100112097 and 21001100112106.

It is not an unprimeable number, because it can be changed into a prime (21001100112121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6845207108 + ... + 6845210175.

It is an arithmetic number, because the mean of its divisors is an integer number (2156240722230).

Almost surely, 2^{21001100112122} is an apocalyptic number.

21001100112122 is a deficient number, since it is larger than the sum of its proper divisors (13498751443558).

21001100112122 is a wasteful number, since it uses less digits than its factorization.

21001100112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13690417357.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001100112122 its reverse (22121100110012), we get a palindrome (43122200222134).

The spelling of 21001100112122 in words is "twenty-one trillion, one billion, one hundred million, one hundred twelve thousand, one hundred twenty-two".