21676773 has 8 divisors (see below), whose sum is σ = 29574688. Its totient is φ = 14115024.

The previous prime is 21676771. The next prime is 21676793. The reversal of 21676773 is 37767612.

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

It is not a de Polignac number, because 21676773 - 2¹ = 21676771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83890 + ... + 84147.

It is an arithmetic number, because the mean of its divisors is an integer number (3696836).

Almost surely, 2^21676773 is an apocalyptic number.

It is an amenable number.

21676773 is a deficient number, since it is larger than the sum of its proper divisors (7897915).

21676773 is a wasteful number, since it uses less digits than its factorization.

21676773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168083.

The product of its digits is 74088, while the sum is 39.

The square root of 21676773 is about 4655.8321490363. The cubic root of 21676773 is about 278.8248923691.

The spelling of 21676773 in words is "twenty-one million, six hundred seventy-six thousand, seven hundred seventy-three".