21861127 has 2 divisors, whose sum is σ = 21861128. Its totient is φ = 21861126.

The previous prime is 21861097. The next prime is 21861137. The reversal of 21861127 is 72116812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21861127 - 2¹⁹ = 21336839 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21861095 and 21861104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21861137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10930563 + 10930564.

It is an arithmetic number, because the mean of its divisors is an integer number (10930564).

Almost surely, 2^21861127 is an apocalyptic number.

21861127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21861127 is an equidigital number, since it uses as much as digits as its factorization.

21861127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 21861127 is about 4675.5884121680. The cubic root of 21861127 is about 279.6131008397.

Adding to 21861127 its reverse (72116812), we get a palindrome (93977939).

The spelling of 21861127 in words is "twenty-one million, eight hundred sixty-one thousand, one hundred twenty-seven".