21268601 has 4 divisors (see below), whose sum is σ = 21387600. Its totient is φ = 21149604.

The previous prime is 21268591. The next prime is 21268613. The reversal of 21268601 is 10686212.

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 21268601 - 2¹⁰ = 21267577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21268631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59231 + ... + 59588.

It is an arithmetic number, because the mean of its divisors is an integer number (5346900).

Almost surely, 2^21268601 is an apocalyptic number.

It is an amenable number.

21268601 is a deficient number, since it is larger than the sum of its proper divisors (118999).

21268601 is a wasteful number, since it uses less digits than its factorization.

21268601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118998.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21268601 is about 4611.7893490488. The cubic root of 21268601 is about 277.0637074510.

The spelling of 21268601 in words is "twenty-one million, two hundred sixty-eight thousand, six hundred one".