21235412 has 24 divisors (see below), whose sum is σ = 40908672. Its totient is φ = 9564800.

The previous prime is 21235367. The next prime is 21235427. The reversal of 21235412 is 21453212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2837 + ... + 7107.

It is an arithmetic number, because the mean of its divisors is an integer number (1704528).

Almost surely, 2^21235412 is an apocalyptic number.

21235412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21235412 is a deficient number, since it is larger than the sum of its proper divisors (19673260).

21235412 is a wasteful number, since it uses less digits than its factorization.

21235412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399 (or 4397 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21235412 is about 4608.1896662355. The cubic root of 21235412 is about 276.9195159482.

Adding to 21235412 its reverse (21453212), we get a palindrome (42688624).

The spelling of 21235412 in words is "twenty-one million, two hundred thirty-five thousand, four hundred twelve".