21337764 has 24 divisors (see below), whose sum is σ = 56900928. Its totient is φ = 6096480.

The previous prime is 21337759. The next prime is 21337777. The reversal of 21337764 is 46773312.

It is a nude number because it is divisible by every one of its digits.

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 in 7 ways as a sum of consecutive naturals, for example, 126927 + ... + 127094.

It is an arithmetic number, because the mean of its divisors is an integer number (2370872).

Almost surely, 2^21337764 is an apocalyptic number.

It is an amenable number.

21337764 is an abundant number, since it is smaller than the sum of its proper divisors (35563164).

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

21337764 is a wasteful number, since it uses less digits than its factorization.

21337764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254035 (or 254033 counting only the distinct ones).

The product of its digits is 21168, while the sum is 33.

The square root of 21337764 is about 4619.2817623522. The cubic root of 21337764 is about 277.3637087405.

The spelling of 21337764 in words is "twenty-one million, three hundred thirty-seven thousand, seven hundred sixty-four".