21938127 has 8 divisors (see below), whose sum is σ = 29931264. Its totient is φ = 14285208.

The previous prime is 21938099. The next prime is 21938129. The reversal of 21938127 is 72183912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21938127 - 2²⁰ = 20889551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938129) 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, 84903 + ... + 85160.

It is an arithmetic number, because the mean of its divisors is an integer number (3741408).

Almost surely, 2^21938127 is an apocalyptic number.

21938127 is a deficient number, since it is larger than the sum of its proper divisors (7993137).

21938127 is a wasteful number, since it uses less digits than its factorization.

21938127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170109.

The product of its digits is 6048, while the sum is 33.

The square root of 21938127 is about 4683.8154318888. The cubic root of 21938127 is about 279.9410037268.

The spelling of 21938127 in words is "twenty-one million, nine hundred thirty-eight thousand, one hundred twenty-seven".