21829849 has 8 divisors (see below), whose sum is σ = 22070048. Its totient is φ = 21591360.

The previous prime is 21829817. The next prime is 21829861. The reversal of 21829849 is 94892812.

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

It is a cyclic number.

It is not a de Polignac number, because 21829849 - 2⁵ = 21829817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21829349) 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, 64609 + ... + 64945.

It is an arithmetic number, because the mean of its divisors is an integer number (2758756).

Almost surely, 2^21829849 is an apocalyptic number.

It is an amenable number.

21829849 is a deficient number, since it is larger than the sum of its proper divisors (240199).

21829849 is a wasteful number, since it uses less digits than its factorization.

21829849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its digits is 82944, while the sum is 43.

The square root of 21829849 is about 4672.2423952531. The cubic root of 21829849 is about 279.4796842216.

The spelling of 21829849 in words is "twenty-one million, eight hundred twenty-nine thousand, eight hundred forty-nine".