21298744 has 16 divisors (see below), whose sum is σ = 39992400. Its totient is φ = 10634112.

The previous prime is 21298741. The next prime is 21298747. The reversal of 21298744 is 44789212.

It is an interprime number because it is at equal distance from previous prime (21298741) and next prime (21298747).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298741) 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, 5904 + ... + 8800.

It is an arithmetic number, because the mean of its divisors is an integer number (2499525).

Almost surely, 2^21298744 is an apocalyptic number.

It is an amenable number.

21298744 is a deficient number, since it is larger than the sum of its proper divisors (18693656).

21298744 is a wasteful number, since it uses less digits than its factorization.

21298744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3822 (or 3818 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 21298744 is about 4615.0562293433. The cubic root of 21298744 is about 277.1945355047.

The spelling of 21298744 in words is "twenty-one million, two hundred ninety-eight thousand, seven hundred forty-four".