21133601 has 8 divisors (see below), whose sum is σ = 22492800. Its totient is φ = 19787328.

The previous prime is 21133589. The next prime is 21133603. The reversal of 21133601 is 10633112.

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 21133601 - 2²² = 16939297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21133601.

It is not an unprimeable number, because it can be changed into a prime (21133603) 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, 260 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (2811600).

Almost surely, 2^21133601 is an apocalyptic number.

It is an amenable number.

21133601 is a deficient number, since it is larger than the sum of its proper divisors (1359199).

21133601 is a wasteful number, since it uses less digits than its factorization.

21133601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21133601 is about 4597.1296479434. The cubic root of 21133601 is about 276.4762527470.

Adding to 21133601 its reverse (10633112), we get a palindrome (31766713).

The spelling of 21133601 in words is "twenty-one million, one hundred thirty-three thousand, six hundred one".