21122001112 has 8 divisors (see below), whose sum is σ = 39603752100. Its totient is φ = 10561000552.

The previous prime is 21122001071. The next prime is 21122001139. The reversal of 21122001112 is 21110022112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21122001112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122001092 and 21122001101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320125062 + ... + 1320125077.

Almost surely, 2^21122001112 is an apocalyptic number.

It is an amenable number.

21122001112 is a deficient number, since it is larger than the sum of its proper divisors (18481750988).

21122001112 is a wasteful number, since it uses less digits than its factorization.

21122001112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640250145 (or 2640250141 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21122001112 its reverse (21110022112), we get a palindrome (42232023224).

The spelling of 21122001112 in words is "twenty-one billion, one hundred twenty-two million, one thousand, one hundred twelve".