21943029 has 8 divisors (see below), whose sum is σ = 29937952. Its totient is φ = 14288400.

The previous prime is 21943027. The next prime is 21943037. The reversal of 21943029 is 92034912.

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

It is not a de Polignac number, because 21943029 - 2¹ = 21943027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21942987 and 21943005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943021) 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, 84922 + ... + 85179.

It is an arithmetic number, because the mean of its divisors is an integer number (3742244).

Almost surely, 2^21943029 is an apocalyptic number.

It is an amenable number.

21943029 is a deficient number, since it is larger than the sum of its proper divisors (7994923).

21943029 is a wasteful number, since it uses less digits than its factorization.

21943029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170147.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 21943029 is about 4684.3386939887. The cubic root of 21943029 is about 279.9618527963.

The spelling of 21943029 in words is "twenty-one million, nine hundred forty-three thousand, twenty-nine".