21211112121112 has 32 divisors (see below), whose sum is σ = 40976465976000. Its totient is φ = 10288048336384.

The previous prime is 21211112121083. The next prime is 21211112121119. The reversal of 21211112121112 is 21112121111212.

It is a super-2 number, since 2×21211112121112² (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 a self number, because there is not a number n which added to its sum of digits gives 21211112121112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211112121119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249570487 + ... + 249655462.

It is an arithmetic number, because the mean of its divisors is an integer number (1280514561750).

Almost surely, 2^{21211112121112} is an apocalyptic number.

It is an amenable number.

21211112121112 is a deficient number, since it is larger than the sum of its proper divisors (19765353854888).

21211112121112 is a wasteful number, since it uses less digits than its factorization.

21211112121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499226115 (or 499226111 counting only the distinct ones).

The product of its digits is 32, while the sum is 19.

Adding to 21211112121112 its reverse (21112121111212), we get a palindrome (42323233232324).

The spelling of 21211112121112 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, one hundred twenty-one thousand, one hundred twelve".