21077338 has 16 divisors (see below), whose sum is σ = 33696000. Its totient is φ = 9864976.

The previous prime is 21077333. The next prime is 21077339. The reversal of 21077338 is 83377012.

It is not an unprimeable number, because it can be changed into a prime (21077333) 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, 2713 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (2106000).

Almost surely, 2^21077338 is an apocalyptic number.

21077338 is a deficient number, since it is larger than the sum of its proper divisors (12618662).

21077338 is a wasteful number, since it uses less digits than its factorization.

21077338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9821.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 21077338 is about 4591.0062077937. The cubic root of 21077338 is about 276.2306847534.

The spelling of 21077338 in words is "twenty-one million, seventy-seven thousand, three hundred thirty-eight".