21900127 has 2 divisors, whose sum is σ = 21900128. Its totient is φ = 21900126.

The previous prime is 21900121. The next prime is 21900139. The reversal of 21900127 is 72100912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21900127 - 2³ = 21900119 is a prime.

It is a super-2 number, since 2×21900127² = 959231125232258, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21900098 and 21900107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21900121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10950063 + 10950064.

It is an arithmetic number, because the mean of its divisors is an integer number (10950064).

Almost surely, 2^21900127 is an apocalyptic number.

21900127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21900127 is an equidigital number, since it uses as much as digits as its factorization.

21900127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21900127 is about 4679.7571518189. The cubic root of 21900127 is about 279.7792775821.

The spelling of 21900127 in words is "twenty-one million, nine hundred thousand, one hundred twenty-seven".