21772282 has 8 divisors (see below), whose sum is σ = 37323936. Its totient is φ = 9330972.

The previous prime is 21772259. The next prime is 21772313. The reversal of 21772282 is 28227712.

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

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, 777568 + ... + 777595.

It is an arithmetic number, because the mean of its divisors is an integer number (4665492).

Almost surely, 2^21772282 is an apocalyptic number.

21772282 is a deficient number, since it is larger than the sum of its proper divisors (15551654).

21772282 is a wasteful number, since it uses less digits than its factorization.

21772282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555172.

The product of its digits is 6272, while the sum is 31.

The square root of 21772282 is about 4666.0777961796. The cubic root of 21772282 is about 279.2337981077.

Adding to 21772282 its reverse (28227712), we get a palindrome (49999994).

The spelling of 21772282 in words is "twenty-one million, seven hundred seventy-two thousand, two hundred eighty-two".