21983229 has 12 divisors (see below), whose sum is σ = 32046300. Its totient is φ = 14520384.

The previous prime is 21983219. The next prime is 21983231. The reversal of 21983229 is 92238912.

It can be written as a sum of positive squares in 2 ways, for example, as 13860729 + 8122500 = 3723^2 + 2850^2 .

It is not a de Polignac number, because 21983229 - 2⁸ = 21982973 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21983193 and 21983202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10224 + ... + 12185.

It is an arithmetic number, because the mean of its divisors is an integer number (2670525).

Almost surely, 2^21983229 is an apocalyptic number.

It is an amenable number.

21983229 is a deficient number, since it is larger than the sum of its proper divisors (10063071).

21983229 is a wasteful number, since it uses less digits than its factorization.

21983229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22524 (or 22521 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21983229 is about 4688.6276243694. The cubic root of 21983229 is about 280.1327134475.

The spelling of 21983229 in words is "twenty-one million, nine hundred eighty-three thousand, two hundred twenty-nine".