21292412 has 12 divisors (see below), whose sum is σ = 38463936. Its totient is φ = 10302720.

The previous prime is 21292393. The next prime is 21292417. The reversal of 21292412 is 21429212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85733 + ... + 85980.

It is an arithmetic number, because the mean of its divisors is an integer number (3205328).

Almost surely, 2^21292412 is an apocalyptic number.

It is an amenable number.

21292412 is a deficient number, since it is larger than the sum of its proper divisors (17171524).

21292412 is a wasteful number, since it uses less digits than its factorization.

21292412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171748 (or 171746 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 21292412 is about 4614.3701628716. The cubic root of 21292412 is about 277.1670633094.

The spelling of 21292412 in words is "twenty-one million, two hundred ninety-two thousand, four hundred twelve".