21289014 has 16 divisors (see below), whose sum is σ = 47309040. Its totient is φ = 7096320.

The previous prime is 21289001. The next prime is 21289027. The reversal of 21289014 is 41098212.

It is an interprime number because it is at equal distance from previous prime (21289001) and next prime (21289027).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 197067 + ... + 197174.

It is an arithmetic number, because the mean of its divisors is an integer number (2956815).

Almost surely, 2^21289014 is an apocalyptic number.

21289014 is an abundant number, since it is smaller than the sum of its proper divisors (26020026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21289014 is a wasteful number, since it uses less digits than its factorization.

21289014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394252 (or 394246 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21289014 is about 4614.0019505848. The cubic root of 21289014 is about 277.1523184043.

The spelling of 21289014 in words is "twenty-one million, two hundred eighty-nine thousand, fourteen".