21438995 has 8 divisors (see below), whose sum is σ = 26111184. Its totient is φ = 16894944.

The previous prime is 21438961. The next prime is 21439079. The reversal of 21438995 is 59983412.

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 21438995 - 2⁶ = 21438931 is a prime.

It is a super-2 number, since 2×21438995² = 919261013220050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31664 + ... + 32333.

It is an arithmetic number, because the mean of its divisors is an integer number (3263898).

Almost surely, 2^21438995 is an apocalyptic number.

21438995 is a deficient number, since it is larger than the sum of its proper divisors (4672189).

21438995 is an equidigital number, since it uses as much as digits as its factorization.

21438995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64069.

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

The square root of 21438995 is about 4630.2262363733. The cubic root of 21438995 is about 277.8016415350.

The spelling of 21438995 in words is "twenty-one million, four hundred thirty-eight thousand, nine hundred ninety-five".