21114431412 has 48 divisors (see below), whose sum is σ = 50530640832. Its totient is φ = 6858046720.

The previous prime is 21114431333. The next prime is 21114431441. The reversal of 21114431412 is 21413441112.

It is a happy number.

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

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 in 15 ways as a sum of consecutive naturals, for example, 380938 + ... + 432830.

It is an arithmetic number, because the mean of its divisors is an integer number (1052721684).

Almost surely, 2^21114431412 is an apocalyptic number.

It is an amenable number.

21114431412 is an abundant number, since it is smaller than the sum of its proper divisors (29416209420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21114431412 is a wasteful number, since it uses less digits than its factorization.

21114431412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52768 (or 52766 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

Adding to 21114431412 its reverse (21413441112), we get a palindrome (42527872524).

It can be divided in two parts, 211144 and 31412, that added together give a triangular number (242556 = T₆₉₆).

The spelling of 21114431412 in words is "twenty-one billion, one hundred fourteen million, four hundred thirty-one thousand, four hundred twelve".