21116407 has 8 divisors (see below), whose sum is σ = 22997520. Its totient is φ = 19272000.

The previous prime is 21116401. The next prime is 21116411. The reversal of 21116407 is 70461112.

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 21116407 - 2³ = 21116399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116401) 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, 7969 + ... + 10282.

It is an arithmetic number, because the mean of its divisors is an integer number (2874690).

Almost surely, 2^21116407 is an apocalyptic number.

21116407 is a deficient number, since it is larger than the sum of its proper divisors (1881113).

21116407 is a wasteful number, since it uses less digits than its factorization.

21116407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18353.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21116407 is about 4595.2591874670. The cubic root of 21116407 is about 276.4012533426.

Adding to 21116407 its reverse (70461112), we get a palindrome (91577519).

The spelling of 21116407 in words is "twenty-one million, one hundred sixteen thousand, four hundred seven".