21162792 has 64 divisors (see below), whose sum is σ = 61102080. Its totient is φ = 5982912.

The previous prime is 21162787. The next prime is 21162793. The reversal of 21162792 is 29726112.

It is not an unprimeable number, because it can be changed into a prime (21162793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16693 + ... + 17915.

It is an arithmetic number, because the mean of its divisors is an integer number (954720).

Almost surely, 2^21162792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21162792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30551040).

21162792 is an abundant number, since it is smaller than the sum of its proper divisors (39939288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21162792 is a wasteful number, since it uses less digits than its factorization.

21162792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1338 counting only the distinct ones).

The product of its digits is 3024, while the sum is 30.

The square root of 21162792 is about 4600.3034682508. The cubic root of 21162792 is about 276.6034893889.

The spelling of 21162792 in words is "twenty-one million, one hundred sixty-two thousand, seven hundred ninety-two".