21122020112 has 20 divisors (see below), whose sum is σ = 41329104396. Its totient is φ = 10456444800.

The previous prime is 21122020057. The next prime is 21122020181. The reversal of 21122020112 is 21102022112.

It can be written as a sum of positive squares in 2 ways, for example, as 9626749456 + 11495270656 = 98116^2 + 107216^2 .

It is a super-2 number, since 2×21122020112² (a number of 21 digits) contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 6533663 + ... + 6536894.

Almost surely, 2^21122020112 is an apocalyptic number.

It is an amenable number.

21122020112 is a deficient number, since it is larger than the sum of its proper divisors (20207084284).

21122020112 is a wasteful number, since it uses less digits than its factorization.

21122020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13070666 (or 13070660 counting only the distinct ones).

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

Adding to 21122020112 its reverse (21102022112), we get a palindrome (42224042224).

The spelling of 21122020112 in words is "twenty-one billion, one hundred twenty-two million, twenty thousand, one hundred twelve".