21938495 has 8 divisors (see below), whose sum is σ = 26519184. Its totient is φ = 17422144.

The previous prime is 21938491. The next prime is 21938533. The reversal of 21938495 is 59483912.

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 21938495 - 2² = 21938491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15329 + ... + 16698.

It is an arithmetic number, because the mean of its divisors is an integer number (3314898).

Almost surely, 2^21938495 is an apocalyptic number.

21938495 is a deficient number, since it is larger than the sum of its proper divisors (4580689).

21938495 is a wasteful number, since it uses less digits than its factorization.

21938495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32169.

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

The square root of 21938495 is about 4683.8547159364. The cubic root of 21938495 is about 279.9425690034.

The spelling of 21938495 in words is "twenty-one million, nine hundred thirty-eight thousand, four hundred ninety-five".