21774069 has 8 divisors (see below), whose sum is σ = 32257920. Its totient is φ = 14516028.

The previous prime is 21774061. The next prime is 21774073. The reversal of 21774069 is 96047712.

It is a happy number.

It is not a de Polignac number, because 21774069 - 2³ = 21774061 is a prime.

It is a super-2 number, since 2×21774069² = 948220161633522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774061) 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, 403197 + ... + 403250.

It is an arithmetic number, because the mean of its divisors is an integer number (4032240).

Almost surely, 2^21774069 is an apocalyptic number.

It is an amenable number.

21774069 is a deficient number, since it is larger than the sum of its proper divisors (10483851).

21774069 is an equidigital number, since it uses as much as digits as its factorization.

21774069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806456 (or 806450 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 21774069 is about 4666.2692806995. The cubic root of 21774069 is about 279.2414374408.

The spelling of 21774069 in words is "twenty-one million, seven hundred seventy-four thousand, sixty-nine".