21767992 has 8 divisors (see below), whose sum is σ = 40815000. Its totient is φ = 10883992.

The previous prime is 21767987. The next prime is 21768029. The reversal of 21767992 is 29976712.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360492 + ... + 1360507.

It is an arithmetic number, because the mean of its divisors is an integer number (5101875).

Almost surely, 2^21767992 is an apocalyptic number.

It is an amenable number.

21767992 is a deficient number, since it is larger than the sum of its proper divisors (19047008).

21767992 is a wasteful number, since it uses less digits than its factorization.

21767992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721005 (or 2721001 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 21767992 is about 4665.6180726673. The cubic root of 21767992 is about 279.2154568718.

The spelling of 21767992 in words is "twenty-one million, seven hundred sixty-seven thousand, nine hundred ninety-two".