21076773 has 4 divisors (see below), whose sum is σ = 28102368. Its totient is φ = 14051180.

The previous prime is 21076739. The next prime is 21076789. The reversal of 21076773 is 37767012.

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 a cyclic number.

It is not a de Polignac number, because 21076773 - 2⁹ = 21076261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076703) 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, 3512793 + ... + 3512798.

It is an arithmetic number, because the mean of its divisors is an integer number (7025592).

Almost surely, 2^21076773 is an apocalyptic number.

It is an amenable number.

21076773 is a deficient number, since it is larger than the sum of its proper divisors (7025595).

21076773 is an equidigital number, since it uses as much as digits as its factorization.

21076773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025594.

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 21076773 is about 4590.9446740295. The cubic root of 21076773 is about 276.2282165143.

The spelling of 21076773 in words is "twenty-one million, seventy-six thousand, seven hundred seventy-three".