21164601 has 4 divisors (see below), whose sum is σ = 28219472. Its totient is φ = 14109732.

The previous prime is 21164593. The next prime is 21164659. The reversal of 21164601 is 10646112.

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 not a de Polignac number, because 21164601 - 2³ = 21164593 is a prime.

It is the 4601-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21164681) by changing a digit.

It is a nontrivial repunit in base 4600.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3527431 + ... + 3527436.

It is an arithmetic number, because the mean of its divisors is an integer number (7054868).

Almost surely, 2^21164601 is an apocalyptic number.

It is an amenable number.

21164601 is a deficient number, since it is larger than the sum of its proper divisors (7054871).

21164601 is an equidigital number, since it uses as much as digits as its factorization.

21164601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7054870.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21164601 is about 4600.5000815129. The cubic root of 21164601 is about 276.6113705396.

The spelling of 21164601 in words is "twenty-one million, one hundred sixty-four thousand, six hundred one".