21769312 has 12 divisors (see below), whose sum is σ = 42858396. Its totient is φ = 10884640.

The previous prime is 21769301. The next prime is 21769313. The reversal of 21769312 is 21396712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21769313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340114 + ... + 340177.

It is an arithmetic number, because the mean of its divisors is an integer number (3571533).

Almost surely, 2^21769312 is an apocalyptic number.

It is an amenable number.

21769312 is a deficient number, since it is larger than the sum of its proper divisors (21089084).

21769312 is an equidigital number, since it uses as much as digits as its factorization.

21769312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680301 (or 680293 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 21769312 is about 4665.7595308803. The cubic root of 21769312 is about 279.2211005856.

The spelling of 21769312 in words is "twenty-one million, seven hundred sixty-nine thousand, three hundred twelve".