21827714021 has 2 divisors, whose sum is σ = 21827714022. Its totient is φ = 21827714020.

The previous prime is 21827714003. The next prime is 21827714039. The reversal of 21827714021 is 12041772812.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21827714003) and next prime (21827714039).

It can be written as a sum of positive squares in only one way, i.e., 21282724996 + 544989025 = 145886^2 + 23345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21827714021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21827714071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10913857010 + 10913857011.

It is an arithmetic number, because the mean of its divisors is an integer number (10913857011).

Almost surely, 2^21827714021 is an apocalyptic number.

It is an amenable number.

21827714021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21827714021 is an equidigital number, since it uses as much as digits as its factorization.

21827714021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The spelling of 21827714021 in words is "twenty-one billion, eight hundred twenty-seven million, seven hundred fourteen thousand, twenty-one".