21077366 has 4 divisors (see below), whose sum is σ = 31616052. Its totient is φ = 10538682.

The previous prime is 21077359. The next prime is 21077369. The reversal of 21077366 is 66377012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5269340 + ... + 5269343.

It is an arithmetic number, because the mean of its divisors is an integer number (7904013).

Almost surely, 2^21077366 is an apocalyptic number.

21077366 is a deficient number, since it is larger than the sum of its proper divisors (10538686).

21077366 is a wasteful number, since it uses less digits than its factorization.

21077366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10538685.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21077366 is about 4591.0092572331. The cubic root of 21077366 is about 276.2308070721.

The spelling of 21077366 in words is "twenty-one million, seventy-seven thousand, three hundred sixty-six".