21349895 has 8 divisors (see below), whose sum is σ = 29279904. Its totient is φ = 14639904.

The previous prime is 21349877. The next prime is 21349907. The reversal of 21349895 is 59894312.

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 21349895 - 2¹⁴ = 21333511 is a prime.

It is a super-2 number, since 2×21349895² = 911636033022050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304964 + ... + 305033.

It is an arithmetic number, because the mean of its divisors is an integer number (3659988).

Almost surely, 2^21349895 is an apocalyptic number.

21349895 is a deficient number, since it is larger than the sum of its proper divisors (7930009).

21349895 is an equidigital number, since it uses as much as digits as its factorization.

21349895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610009.

The product of its digits is 77760, while the sum is 41.

The square root of 21349895 is about 4620.5946586992. The cubic root of 21349895 is about 277.4162612903.

The spelling of 21349895 in words is "twenty-one million, three hundred forty-nine thousand, eight hundred ninety-five".