21294124 has 24 divisors (see below), whose sum is σ = 38153808. Its totient is φ = 10395840.

The previous prime is 21294121. The next prime is 21294127. The reversal of 21294124 is 42149212.

It is an interprime number because it is at equal distance from previous prime (21294121) and next prime (21294127).

It is not an unprimeable number, because it can be changed into a prime (21294121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 47847 + ... + 48289.

It is an arithmetic number, because the mean of its divisors is an integer number (1589742).

Almost surely, 2^21294124 is an apocalyptic number.

It is an amenable number.

21294124 is a deficient number, since it is larger than the sum of its proper divisors (16859684).

21294124 is a wasteful number, since it uses less digits than its factorization.

21294124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 703 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 21294124 is about 4614.5556665837. Note that the first 3 decimals coincide. The cubic root of 21294124 is about 277.1744915785.

The spelling of 21294124 in words is "twenty-one million, two hundred ninety-four thousand, one hundred twenty-four".