21882729 has 24 divisors (see below), whose sum is σ = 33477696. Its totient is φ = 12680800.

The previous prime is 21882703. The next prime is 21882739. The reversal of 21882729 is 92728812.

It is not a de Polignac number, because 21882729 - 2⁸ = 21882473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21882739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7039 + ... + 9659.

It is an arithmetic number, because the mean of its divisors is an integer number (1394904).

Almost surely, 2^21882729 is an apocalyptic number.

It is an amenable number.

21882729 is a deficient number, since it is larger than the sum of its proper divisors (11594967).

21882729 is a wasteful number, since it uses less digits than its factorization.

21882729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669 (or 2658 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 21882729 is about 4677.8979253507. The cubic root of 21882729 is about 279.7051701059.

The spelling of 21882729 in words is "twenty-one million, eight hundred eighty-two thousand, seven hundred twenty-nine".