21067077 has 4 divisors (see below), whose sum is σ = 28089440. Its totient is φ = 14044716.

The previous prime is 21067043. The next prime is 21067087. The reversal of 21067077 is 77076012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21067077 - 2⁸ = 21066821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067037) 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 3 ways as a sum of consecutive naturals, for example, 3511177 + ... + 3511182.

It is an arithmetic number, because the mean of its divisors is an integer number (7022360).

Almost surely, 2^21067077 is an apocalyptic number.

It is an amenable number.

21067077 is a deficient number, since it is larger than the sum of its proper divisors (7022363).

21067077 is an equidigital number, since it uses as much as digits as its factorization.

21067077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7022362.

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

The square root of 21067077 is about 4589.8885607387. Note that the first 3 decimals coincide. The cubic root of 21067077 is about 276.1858520341.

The spelling of 21067077 in words is "twenty-one million, sixty-seven thousand, seventy-seven".