21113031412 has 24 divisors (see below), whose sum is σ = 40539697632. Its totient is φ = 9541356000.

The previous prime is 21113031403. The next prime is 21113031419. The reversal of 21113031412 is 21413031112.

It is a self number, because there is not a number n which added to its sum of digits gives 21113031412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113031419) 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, 1379214 + ... + 1394437.

It is an arithmetic number, because the mean of its divisors is an integer number (1689154068).

Almost surely, 2^21113031412 is an apocalyptic number.

21113031412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21113031412 is a deficient number, since it is larger than the sum of its proper divisors (19426666220).

21113031412 is a wasteful number, since it uses less digits than its factorization.

21113031412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773839 (or 2773837 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21113031412 its reverse (21413031112), we get a palindrome (42526062524).

The spelling of 21113031412 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, four hundred twelve".