21940027 has 2 divisors, whose sum is σ = 21940028. Its totient is φ = 21940026.

The previous prime is 21939997. The next prime is 21940063. The reversal of 21940027 is 72004912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21940027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21939983 and 21940010.

It is not a weakly prime, because it can be changed into another prime (21940067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10970013 + 10970014.

It is an arithmetic number, because the mean of its divisors is an integer number (10970014).

Almost surely, 2^21940027 is an apocalyptic number.

21940027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21940027 is an equidigital number, since it uses as much as digits as its factorization.

21940027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21940027 is about 4684.0182535938. The cubic root of 21940027 is about 279.9490851300.

Adding to 21940027 its reverse (72004912), we get a palindrome (93944939).

The spelling of 21940027 in words is "twenty-one million, nine hundred forty thousand, twenty-seven".