21313195 has 4 divisors (see below), whose sum is σ = 25575840. Its totient is φ = 17050552.

The previous prime is 21313181. The next prime is 21313199. The reversal of 21313195 is 59131312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21313195 - 2¹³ = 21305003 is a prime.

It is a super-2 number, since 2×21313195² = 908504562216050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21313199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131315 + ... + 2131324.

It is an arithmetic number, because the mean of its divisors is an integer number (6393960).

Almost surely, 2^21313195 is an apocalyptic number.

21313195 is a deficient number, since it is larger than the sum of its proper divisors (4262645).

21313195 is an equidigital number, since it uses as much as digits as its factorization.

21313195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262644.

The product of its digits is 810, while the sum is 25.

The square root of 21313195 is about 4616.6216002614. The cubic root of 21313195 is about 277.2572126376.

The spelling of 21313195 in words is "twenty-one million, three hundred thirteen thousand, one hundred ninety-five".