21116677 has 8 divisors (see below), whose sum is σ = 22150656. Its totient is φ = 20107152.

The previous prime is 21116663. The next prime is 21116687. The reversal of 21116677 is 77661112.

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

It is a cyclic number.

It is not a de Polignac number, because 21116677 - 2²³ = 12728069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4333 + ... + 7810.

It is an arithmetic number, because the mean of its divisors is an integer number (2768832).

Almost surely, 2^21116677 is an apocalyptic number.

It is an amenable number.

21116677 is a deficient number, since it is larger than the sum of its proper divisors (1033979).

21116677 is a wasteful number, since it uses less digits than its factorization.

21116677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12227.

The product of its digits is 3528, while the sum is 31.

The square root of 21116677 is about 4595.2885654766. The cubic root of 21116677 is about 276.4024313843.

Adding to 21116677 its reverse (77661112), we get a palindrome (98777789).

The spelling of 21116677 in words is "twenty-one million, one hundred sixteen thousand, six hundred seventy-seven".