21829049 has 4 divisors (see below), whose sum is σ = 23813520. Its totient is φ = 19844580.

The previous prime is 21828973. The next prime is 21829091. The reversal of 21829049 is 94092812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21829049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21829349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992219 + ... + 992240.

It is an arithmetic number, because the mean of its divisors is an integer number (5953380).

Almost surely, 2^21829049 is an apocalyptic number.

It is an amenable number.

21829049 is a deficient number, since it is larger than the sum of its proper divisors (1984471).

21829049 is a wasteful number, since it uses less digits than its factorization.

21829049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984470.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 21829049 is about 4672.1567824721. The cubic root of 21829049 is about 279.4762701427.

The spelling of 21829049 in words is "twenty-one million, eight hundred twenty-nine thousand, forty-nine".