21827937 has 16 divisors (see below), whose sum is σ = 30433280. Its totient is φ = 13899600.

The previous prime is 21827917. The next prime is 21827951. The reversal of 21827937 is 73972812.

It is not a de Polignac number, because 21827937 - 2⁷ = 21827809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21827895 and 21827904.

It is not an unprimeable number, because it can be changed into a prime (21827917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5862 + ... + 8832.

It is an arithmetic number, because the mean of its divisors is an integer number (1902080).

Almost surely, 2^21827937 is an apocalyptic number.

It is an amenable number.

21827937 is a deficient number, since it is larger than the sum of its proper divisors (8605343).

21827937 is a wasteful number, since it uses less digits than its factorization.

21827937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084.

The product of its digits is 42336, while the sum is 39.

The square root of 21827937 is about 4672.0377781007. The cubic root of 21827937 is about 279.4715244345.

The spelling of 21827937 in words is "twenty-one million, eight hundred twenty-seven thousand, nine hundred thirty-seven".