21133412 has 12 divisors (see below), whose sum is σ = 38591616. Its totient is φ = 10107240.

The previous prime is 21133403. The next prime is 21133423. The reversal of 21133412 is 21433112.

It is a super-2 number, since 2×21133412² = 893242205523488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114764 + ... + 114947.

It is an arithmetic number, because the mean of its divisors is an integer number (3215968).

Almost surely, 2^21133412 is an apocalyptic number.

It is an amenable number.

21133412 is a deficient number, since it is larger than the sum of its proper divisors (17458204).

21133412 is a wasteful number, since it uses less digits than its factorization.

21133412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229738 (or 229736 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 21133412 is about 4597.1090915922. The cubic root of 21133412 is about 276.4754285592.

Adding to 21133412 its reverse (21433112), we get a palindrome (42566524).

The spelling of 21133412 in words is "twenty-one million, one hundred thirty-three thousand, four hundred twelve".