21967288 has 24 divisors (see below), whose sum is σ = 47914200. Its totient is φ = 9414384.

The previous prime is 21967271. The next prime is 21967303. The reversal of 21967288 is 88276912.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27628 + ... + 28411.

It is an arithmetic number, because the mean of its divisors is an integer number (1996425).

Almost surely, 2^21967288 is an apocalyptic number.

21967288 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21967288 is an abundant number, since it is smaller than the sum of its proper divisors (25946912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21967288 is a wasteful number, since it uses less digits than its factorization.

21967288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56059 (or 56048 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 21967288 is about 4686.9273516879. The cubic root of 21967288 is about 280.0649849165.

The spelling of 21967288 in words is "twenty-one million, nine hundred sixty-seven thousand, two hundred eighty-eight".