21829398 has 8 divisors (see below), whose sum is σ = 43658808. Its totient is φ = 7276464.

The previous prime is 21829397. The next prime is 21829421. The reversal of 21829398 is 89392812.

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

21829398 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21829397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819111 + ... + 1819122.

It is an arithmetic number, because the mean of its divisors is an integer number (5457351).

Almost surely, 2^21829398 is an apocalyptic number.

21829398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21829398 is a wasteful number, since it uses less digits than its factorization.

21829398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638238.

The product of its digits is 62208, while the sum is 42.

The square root of 21829398 is about 4672.1941312407. The cubic root of 21829398 is about 279.4777595449.

The spelling of 21829398 in words is "twenty-one million, eight hundred twenty-nine thousand, three hundred ninety-eight".