21773946 has 8 divisors (see below), whose sum is σ = 43547904. Its totient is φ = 7257980.

The previous prime is 21773863. The next prime is 21773951. The reversal of 21773946 is 64937712.

It is a sphenic number, since it is the product of 3 distinct primes.

21773946 is an admirable 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, 1814490 + ... + 1814501.

It is an arithmetic number, because the mean of its divisors is an integer number (5443488).

Almost surely, 2^21773946 is an apocalyptic number.

21773946 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21773946 is a wasteful number, since it uses less digits than its factorization.

21773946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628996.

The product of its digits is 63504, while the sum is 39.

The square root of 21773946 is about 4666.2561009872. The cubic root of 21773946 is about 279.2409116355.

The spelling of 21773946 in words is "twenty-one million, seven hundred seventy-three thousand, nine hundred forty-six".