21893229 has 12 divisors (see below), whose sum is σ = 33483996. Its totient is φ = 13736832.

The previous prime is 21893227. The next prime is 21893237. The reversal of 21893229 is 92239812.

It can be written as a sum of positive squares in 2 ways, for example, as 8277129 + 13616100 = 2877^2 + 3690^2 .

It is not a de Polignac number, because 21893229 - 2¹ = 21893227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21893193 and 21893202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893227) 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 11 ways as a sum of consecutive naturals, for example, 71394 + ... + 71699.

It is an arithmetic number, because the mean of its divisors is an integer number (2790333).

Almost surely, 2^21893229 is an apocalyptic number.

It is an amenable number.

21893229 is a deficient number, since it is larger than the sum of its proper divisors (11590767).

21893229 is a wasteful number, since it uses less digits than its factorization.

21893229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143116 (or 143113 counting only the distinct ones).

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

The square root of 21893229 is about 4679.0200897196. The cubic root of 21893229 is about 279.7498999729.

It can be divided in two parts, 21893 and 229, that added together give a palindrome (22122).

The spelling of 21893229 in words is "twenty-one million, eight hundred ninety-three thousand, two hundred twenty-nine".