21827763 has 12 divisors (see below), whose sum is σ = 31580328. Its totient is φ = 14528160.

The previous prime is 21827753. The next prime is 21827777. The reversal of 21827763 is 36772812.

It is not a de Polignac number, because 21827763 - 2²² = 17633459 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21827723) 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 11 ways as a sum of consecutive naturals, for example, 5256 + ... + 8442.

It is an arithmetic number, because the mean of its divisors is an integer number (2631694).

Almost surely, 2^21827763 is an apocalyptic number.

21827763 is a deficient number, since it is larger than the sum of its proper divisors (9752565).

21827763 is a wasteful number, since it uses less digits than its factorization.

21827763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954 (or 3951 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 21827763 is about 4672.0191566388. The cubic root of 21827763 is about 279.4707818361.

The spelling of 21827763 in words is "twenty-one million, eight hundred twenty-seven thousand, seven hundred sixty-three".