21142329 has 8 divisors (see below), whose sum is σ = 30358272. Its totient is φ = 13010640.

The previous prime is 21142291. The next prime is 21142343. The reversal of 21142329 is 92324112.

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

It is not a de Polignac number, because 21142329 - 2⁷ = 21142201 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21142299 and 21142308.

It is not an unprimeable number, because it can be changed into a prime (21142349) 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, 271017 + ... + 271094.

It is an arithmetic number, because the mean of its divisors is an integer number (3794784).

Almost surely, 2^21142329 is an apocalyptic number.

It is an amenable number.

21142329 is a deficient number, since it is larger than the sum of its proper divisors (9215943).

21142329 is a wasteful number, since it uses less digits than its factorization.

21142329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542127.

The product of its digits is 864, while the sum is 24.

The square root of 21142329 is about 4598.0788379496. The cubic root of 21142329 is about 276.5143083000.

The spelling of 21142329 in words is "twenty-one million, one hundred forty-two thousand, three hundred twenty-nine".