21829201 has 4 divisors (see below), whose sum is σ = 22105600. Its totient is φ = 21552804.

The previous prime is 21829193. The next prime is 21829211. The reversal of 21829201 is 10292812.

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 not a de Polignac number, because 21829201 - 2³ = 21829193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21829211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138081 + ... + 138238.

It is an arithmetic number, because the mean of its divisors is an integer number (5526400).

Almost surely, 2^21829201 is an apocalyptic number.

It is an amenable number.

21829201 is a deficient number, since it is larger than the sum of its proper divisors (276399).

21829201 is an equidigital number, since it uses as much as digits as its factorization.

21829201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276398.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21829201 is about 4672.1730490212. The cubic root of 21829201 is about 279.4769188241.

The spelling of 21829201 in words is "twenty-one million, eight hundred twenty-nine thousand, two hundred one".