21016494 has 24 divisors (see below), whose sum is σ = 45781632. Its totient is φ = 6967680.

The previous prime is 21016483. The next prime is 21016507. The reversal of 21016494 is 49461012.

21016494 is a `hidden beast` number, since 2 + 10 + 1 + 649 + 4 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 382 + ... + 6494.

It is an arithmetic number, because the mean of its divisors is an integer number (1907568).

Almost surely, 2^21016494 is an apocalyptic number.

21016494 is an abundant number, since it is smaller than the sum of its proper divisors (24765138).

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

21016494 is a wasteful number, since it uses less digits than its factorization.

21016494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6312 (or 6309 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21016494 is about 4584.3749846626. The cubic root of 21016494 is about 275.9646299980.

The spelling of 21016494 in words is "twenty-one million, sixteen thousand, four hundred ninety-four".