21829601 has 4 divisors (see below), whose sum is σ = 21892500. Its totient is φ = 21766704.

The previous prime is 21829597. The next prime is 21829607. The reversal of 21829601 is 10692812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 1893376 = 4465^2 + 1376^2 .

It is a cyclic number.

It is not a de Polignac number, because 21829601 - 2² = 21829597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21829607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30926 + ... + 31623.

It is an arithmetic number, because the mean of its divisors is an integer number (5473125).

Almost surely, 2^21829601 is an apocalyptic number.

It is an amenable number.

21829601 is a deficient number, since it is larger than the sum of its proper divisors (62899).

21829601 is an equidigital number, since it uses as much as digits as its factorization.

21829601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62898.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21829601 is about 4672.2158554587. The cubic root of 21829601 is about 279.4786258661.

The spelling of 21829601 in words is "twenty-one million, eight hundred twenty-nine thousand, six hundred one".