21294889 has 8 divisors (see below), whose sum is σ = 26549568. Its totient is φ = 16593360.

The previous prime is 21294881. The next prime is 21294893. The reversal of 21294889 is 98849212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21294889 - 2³ = 21294881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21294881) 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 7 ways as a sum of consecutive naturals, for example, 138202 + ... + 138355.

It is an arithmetic number, because the mean of its divisors is an integer number (3318696).

Almost surely, 2^21294889 is an apocalyptic number.

It is an amenable number.

21294889 is a deficient number, since it is larger than the sum of its proper divisors (5254679).

21294889 is a wasteful number, since it uses less digits than its factorization.

21294889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276575.

The product of its digits is 82944, while the sum is 43.

The square root of 21294889 is about 4614.6385557268. The cubic root of 21294889 is about 277.1778107405.

The spelling of 21294889 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred eighty-nine".