21879127 has 6 divisors (see below), whose sum is σ = 23091648. Its totient is φ = 20727252.

The previous prime is 21879103. The next prime is 21879139. The reversal of 21879127 is 72197812.

It is not a de Polignac number, because 21879127 - 2¹⁵ = 21846359 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 (21879167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29943 + ... + 30664.

It is an arithmetic number, because the mean of its divisors is an integer number (3848608).

Almost surely, 2^21879127 is an apocalyptic number.

21879127 is a deficient number, since it is larger than the sum of its proper divisors (1212521).

21879127 is an equidigital number, since it uses as much as digits as its factorization.

21879127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60645 (or 60626 counting only the distinct ones).

The product of its digits is 14112, while the sum is 37.

The square root of 21879127 is about 4677.5129075183. The cubic root of 21879127 is about 279.6898223354.

The spelling of 21879127 in words is "twenty-one million, eight hundred seventy-nine thousand, one hundred twenty-seven".