21827768 has 8 divisors (see below), whose sum is σ = 40927080. Its totient is φ = 10913880.

The previous prime is 21827753. The next prime is 21827777. The reversal of 21827768 is 86772812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364228 + ... + 1364243.

It is an arithmetic number, because the mean of its divisors is an integer number (5115885).

Almost surely, 2^21827768 is an apocalyptic number.

It is an amenable number.

21827768 is a deficient number, since it is larger than the sum of its proper divisors (19099312).

21827768 is a wasteful number, since it uses less digits than its factorization.

21827768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728477 (or 2728473 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 21827768 is about 4672.0196917393. The cubic root of 21827768 is about 279.4708031752.

The spelling of 21827768 in words is "twenty-one million, eight hundred twenty-seven thousand, seven hundred sixty-eight".