21301369 has 4 divisors (see below), whose sum is σ = 21558096. Its totient is φ = 21044644.

The previous prime is 21301363. The next prime is 21301403. The reversal of 21301369 is 96310312.

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 21301369 - 2³ = 21301361 is a prime.

It is a super-2 number, since 2×21301369² = 907496642548322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21301361) 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, 128239 + ... + 128404.

It is an arithmetic number, because the mean of its divisors is an integer number (5389524).

Almost surely, 2^21301369 is an apocalyptic number.

It is an amenable number.

21301369 is a deficient number, since it is larger than the sum of its proper divisors (256727).

21301369 is an equidigital number, since it uses as much as digits as its factorization.

21301369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256726.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 21301369 is about 4615.3406158159. The cubic root of 21301369 is about 277.2059228079.

The spelling of 21301369 in words is "twenty-one million, three hundred one thousand, three hundred sixty-nine".