21195601 has 8 divisors (see below), whose sum is σ = 24681024. Its totient is φ = 17824560.

The previous prime is 21195593. The next prime is 21195611. The reversal of 21195601 is 10659112.

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

It is a cyclic number.

It is not a de Polignac number, because 21195601 - 2³ = 21195593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21195611) 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, 28195 + ... + 28936.

It is an arithmetic number, because the mean of its divisors is an integer number (3085128).

Almost surely, 2^21195601 is an apocalyptic number.

It is an amenable number.

21195601 is a deficient number, since it is larger than the sum of its proper divisors (3485423).

21195601 is an equidigital number, since it uses as much as digits as its factorization.

21195601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57191.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 21195601 is about 4603.8680476313. The cubic root of 21195601 is about 276.7463564576.

The spelling of 21195601 in words is "twenty-one million, one hundred ninety-five thousand, six hundred one".