21919773 has 8 divisors (see below), whose sum is σ = 29248128. Its totient is φ = 14602304.

The previous prime is 21919771. The next prime is 21919811. The reversal of 21919773 is 37791912.

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

It is a cyclic number.

It is not a de Polignac number, because 21919773 - 2¹ = 21919771 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5740 + ... + 8762.

It is an arithmetic number, because the mean of its divisors is an integer number (3656016).

Almost surely, 2^21919773 is an apocalyptic number.

It is an amenable number.

21919773 is a deficient number, since it is larger than the sum of its proper divisors (7328355).

21919773 is a wasteful number, since it uses less digits than its factorization.

21919773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5443.

The product of its digits is 23814, while the sum is 39.

The square root of 21919773 is about 4681.8557218265. The cubic root of 21919773 is about 279.8629133362.

The spelling of 21919773 in words is "twenty-one million, nine hundred nineteen thousand, seven hundred seventy-three".