21116938 has 8 divisors (see below), whose sum is σ = 31917600. Its totient is φ = 10477740.

The previous prime is 21116933. The next prime is 21116951. The reversal of 21116938 is 83961112.

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

It is not an unprimeable number, because it can be changed into a prime (21116933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40038 + ... + 40561.

It is an arithmetic number, because the mean of its divisors is an integer number (3989700).

Almost surely, 2^21116938 is an apocalyptic number.

21116938 is a deficient number, since it is larger than the sum of its proper divisors (10800662).

21116938 is a wasteful number, since it uses less digits than its factorization.

21116938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80732.

The product of its digits is 2592, while the sum is 31.

The square root of 21116938 is about 4595.3169640407. The cubic root of 21116938 is about 276.4035701483.

The spelling of 21116938 in words is "twenty-one million, one hundred sixteen thousand, nine hundred thirty-eight".