21116494 has 8 divisors (see below), whose sum is σ = 36199728. Its totient is φ = 9049920.

The previous prime is 21116479. The next prime is 21116503. The reversal of 21116494 is 49461112.

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

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 3 ways as a sum of consecutive naturals, for example, 754147 + ... + 754174.

It is an arithmetic number, because the mean of its divisors is an integer number (4524966).

Almost surely, 2^21116494 is an apocalyptic number.

21116494 is a deficient number, since it is larger than the sum of its proper divisors (15083234).

21116494 is a wasteful number, since it uses less digits than its factorization.

21116494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508330.

The product of its digits is 1728, while the sum is 28.

The square root of 21116494 is about 4595.2686537351. The cubic root of 21116494 is about 276.4016329349.

The spelling of 21116494 in words is "twenty-one million, one hundred sixteen thousand, four hundred ninety-four".