21122121211112 has 16 divisors (see below), whose sum is σ = 39616715811300. Its totient is φ = 10557663661440.

The previous prime is 21122121211099. The next prime is 21122121211153. The reversal of 21122121211112 is 21111212122112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20672971936516 + 449149274596 = 4546754^2 + 670186^2 .

It is a super-2 number, since 2×21122121211112² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424591589 + ... + 424641332.

Almost surely, 2^{21122121211112} is an apocalyptic number.

It is an amenable number.

21122121211112 is a deficient number, since it is larger than the sum of its proper divisors (18494594600188).

21122121211112 is a wasteful number, since it uses less digits than its factorization.

21122121211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849236036 (or 849236032 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 21122121211112 its reverse (21111212122112), we get a palindrome (42233333333224).

The spelling of 21122121211112 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twelve".