21134212 has 36 divisors (see below), whose sum is σ = 41341104. Its totient is φ = 9374640.

The previous prime is 21134173. The next prime is 21134221. The reversal of 21134212 is 21243112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197463 + ... + 197569.

It is an arithmetic number, because the mean of its divisors is an integer number (1148364).

Almost surely, 2^21134212 is an apocalyptic number.

21134212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21134212 is a deficient number, since it is larger than the sum of its proper divisors (20206892).

21134212 is a wasteful number, since it uses less digits than its factorization.

21134212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 187 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21134212 is about 4597.1961019735. The cubic root of 21134212 is about 276.4789171512.

Adding to 21134212 its reverse (21243112), we get a palindrome (42377324).

Subtracting 21134212 from its reverse (21243112), we obtain a square (108900 = 330²).

The spelling of 21134212 in words is "twenty-one million, one hundred thirty-four thousand, two hundred twelve".