21826992 has 80 divisors (see below), whose sum is σ = 62531712. Its totient is φ = 6504960.

The previous prime is 21826979. The next prime is 21826993. The reversal of 21826992 is 29962812.

It is a self number, because there is not a number n which added to its sum of digits gives 21826992.

It is not an unprimeable number, because it can be changed into a prime (21826993) 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, 35068 + ... + 35684.

Almost surely, 2^21826992 is an apocalyptic number.

21826992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21826992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31265856).

21826992 is an abundant number, since it is smaller than the sum of its proper divisors (40704720).

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

21826992 is a wasteful number, since it uses less digits than its factorization.

21826992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 700 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 21826992 is about 4671.9366434060. The cubic root of 21826992 is about 279.4674913094.

The spelling of 21826992 in words is "twenty-one million, eight hundred twenty-six thousand, nine hundred ninety-two".