21116486 has 8 divisors (see below), whose sum is σ = 33341880. Its totient is φ = 10002528.

The previous prime is 21116479. The next prime is 21116503. The reversal of 21116486 is 68461112.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277811 + ... + 277886.

It is an arithmetic number, because the mean of its divisors is an integer number (4167735).

Almost surely, 2^21116486 is an apocalyptic number.

21116486 is a deficient number, since it is larger than the sum of its proper divisors (12225394).

21116486 is a wasteful number, since it uses less digits than its factorization.

21116486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555718.

The product of its digits is 2304, while the sum is 29.

The square root of 21116486 is about 4595.2677832744. The cubic root of 21116486 is about 276.4015980299.

Adding to 21116486 its reverse (68461112), we get a palindrome (89577598).

The spelling of 21116486 in words is "twenty-one million, one hundred sixteen thousand, four hundred eighty-six".