21772798 has 8 divisors (see below), whose sum is σ = 33541992. Its totient is φ = 10592136.

The previous prime is 21772787. The next prime is 21772811. The reversal of 21772798 is 89727712.

It is a happy number.

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

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, 147040 + ... + 147187.

It is an arithmetic number, because the mean of its divisors is an integer number (4192749).

Almost surely, 2^21772798 is an apocalyptic number.

21772798 is a deficient number, since it is larger than the sum of its proper divisors (11769194).

21772798 is a wasteful number, since it uses less digits than its factorization.

21772798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294266.

The product of its digits is 98784, while the sum is 43.

The square root of 21772798 is about 4666.1330885434. The cubic root of 21772798 is about 279.2360040241.

The spelling of 21772798 in words is "twenty-one million, seven hundred seventy-two thousand, seven hundred ninety-eight".