21852829 has 8 divisors (see below), whose sum is σ = 23420160. Its totient is φ = 20336976.

The previous prime is 21852827. The next prime is 21852851. The reversal of 21852829 is 92825812.

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

It is not a de Polignac number, because 21852829 - 2¹ = 21852827 is a prime.

It is a super-2 number, since 2×21852829² = 955092270606482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852827) 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, 11989 + ... + 13690.

It is an arithmetic number, because the mean of its divisors is an integer number (2927520).

Almost surely, 2^21852829 is an apocalyptic number.

It is an amenable number.

21852829 is a deficient number, since it is larger than the sum of its proper divisors (1567331).

21852829 is a wasteful number, since it uses less digits than its factorization.

21852829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25739.

The product of its digits is 23040, while the sum is 37.

The square root of 21852829 is about 4674.7009530022. The cubic root of 21852829 is about 279.5777180475.

The spelling of 21852829 in words is "twenty-one million, eight hundred fifty-two thousand, eight hundred twenty-nine".