21773912 has 16 divisors (see below), whose sum is σ = 40875840. Its totient is φ = 10873696.

The previous prime is 21773863. The next prime is 21773951. The reversal of 21773912 is 21937712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11033 + ... + 12855.

It is an arithmetic number, because the mean of its divisors is an integer number (2554740).

Almost surely, 2^21773912 is an apocalyptic number.

It is an amenable number.

21773912 is a deficient number, since it is larger than the sum of its proper divisors (19101928).

21773912 is a wasteful number, since it uses less digits than its factorization.

21773912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322 (or 3318 counting only the distinct ones).

The product of its digits is 5292, while the sum is 32.

The square root of 21773912 is about 4666.2524578081. The cubic root of 21773912 is about 279.2407662906.

The spelling of 21773912 in words is "twenty-one million, seven hundred seventy-three thousand, nine hundred twelve".