21829125 has 16 divisors (see below), whose sum is σ = 36324288. Its totient is φ = 11642000.

The previous prime is 21829121. The next prime is 21829127. The reversal of 21829125 is 52192812.

It is not a de Polignac number, because 21829125 - 2² = 21829121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21829092 and 21829101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28731 + ... + 29480.

It is an arithmetic number, because the mean of its divisors is an integer number (2270268).

Almost surely, 2^21829125 is an apocalyptic number.

21829125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21829125 is a deficient number, since it is larger than the sum of its proper divisors (14495163).

21829125 is an equidigital number, since it uses as much as digits as its factorization.

21829125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58229 (or 58219 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 21829125 is about 4672.1649157537. The cubic root of 21829125 is about 279.4765944838.

The spelling of 21829125 in words is "twenty-one million, eight hundred twenty-nine thousand, one hundred twenty-five".