21967804 has 6 divisors (see below), whose sum is σ = 38443664. Its totient is φ = 10983900.

The previous prime is 21967801. The next prime is 21967807. The reversal of 21967804 is 40876912.

It is an interprime number because it is at equal distance from previous prime (21967801) and next prime (21967807).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21967801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2745972 + ... + 2745979.

Almost surely, 2^21967804 is an apocalyptic number.

It is an amenable number.

21967804 is a deficient number, since it is larger than the sum of its proper divisors (16475860).

21967804 is a wasteful number, since it uses less digits than its factorization.

21967804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491955 (or 5491953 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21967804 is about 4686.9823980894. The cubic root of 21967804 is about 280.0671777589.

It can be divided in two parts, 2196 and 7804, that added together give a 4-th power (10000 = 10⁴).

The spelling of 21967804 in words is "twenty-one million, nine hundred sixty-seven thousand, eight hundred four".