21077067 has 8 divisors (see below), whose sum is σ = 30657600. Its totient is φ = 12773960.

The previous prime is 21077057. The next prime is 21077081. The reversal of 21077067 is 76077012.

It is a happy number.

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 21077067 - 2⁴ = 21077051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21077027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319317 + ... + 319382.

It is an arithmetic number, because the mean of its divisors is an integer number (3832200).

Almost surely, 2^21077067 is an apocalyptic number.

21077067 is a deficient number, since it is larger than the sum of its proper divisors (9580533).

21077067 is a wasteful number, since it uses less digits than its factorization.

21077067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638713.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 21077067 is about 4590.9766934717. The cubic root of 21077067 is about 276.2295008778.

Subtracting 21077067 from its reverse (76077012), we obtain a palindrome (54999945).

It can be divided in two parts, 210 and 77067, that added together give a palindrome (77277).

The spelling of 21077067 in words is "twenty-one million, seventy-seven thousand, sixty-seven".