21122110012 has 12 divisors (see below), whose sum is σ = 37750154400.
Its totient is φ = 10336351616.
The previous prime is 21122110001. The next prime is 21122110013. The reversal of 21122110012 is 21001122112.
It is a super-2 number, since 2×211221100122 (a number of 21 digits) contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 21122109974 and 21122110001.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21122110013) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56175637 + ... + 56176012.
It is an arithmetic number, because the mean of its divisors is an integer number (3145846200).
Almost surely, 221122110012 is an apocalyptic number.
It is an amenable number.
21122110012 is a deficient number, since it is larger than the sum of its proper divisors (16628044388).
21122110012 is a wasteful number, since it uses less digits than its factorization.
21122110012 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 112351700 (or 112351698 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 13.
Adding to 21122110012 its reverse (21001122112), we get a palindrome (42123232124).
The spelling of 21122110012 in words is "twenty-one billion, one hundred twenty-two million, one hundred ten thousand, twelve".