21727093 has 2 divisors, whose sum is σ = 21727094. Its totient is φ = 21727092.

The previous prime is 21727091. The next prime is 21727109. The reversal of 21727093 is 39072712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 178929 = 4642^2 + 423^2 .

It is a cyclic number.

It is not a de Polignac number, because 21727093 - 2¹ = 21727091 is a prime.

Together with 21727091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21727091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863546 + 10863547.

It is an arithmetic number, because the mean of its divisors is an integer number (10863547).

Almost surely, 2^21727093 is an apocalyptic number.

It is an amenable number.

21727093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21727093 is an equidigital number, since it uses as much as digits as its factorization.

21727093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21727093 is about 4661.2329913876. The cubic root of 21727093 is about 279.0404783619.

It can be divided in two parts, 2172709 and 3, that added together give a palindrome (2172712).

The spelling of 21727093 in words is "twenty-one million, seven hundred twenty-seven thousand, ninety-three".