21934229 has 8 divisors (see below), whose sum is σ = 22612128. Its totient is φ = 21260880.

The previous prime is 21934223. The next prime is 21934277. The reversal of 21934229 is 92243912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21934229 is a prime.

It is a super-2 number, since 2×21934229² = 962220803648882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21934195 and 21934204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10394 + ... + 12324.

It is an arithmetic number, because the mean of its divisors is an integer number (2826516).

Almost surely, 2^21934229 is an apocalyptic number.

It is an amenable number.

21934229 is a deficient number, since it is larger than the sum of its proper divisors (677899).

21934229 is a wasteful number, since it uses less digits than its factorization.

21934229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275.

The product of its digits is 7776, while the sum is 32.

The square root of 21934229 is about 4683.3992996540. The cubic root of 21934229 is about 279.9244226293.

The spelling of 21934229 in words is "twenty-one million, nine hundred thirty-four thousand, two hundred twenty-nine".