21038114221 has 2 divisors, whose sum is σ = 21038114222. Its totient is φ = 21038114220.

The previous prime is 21038114179. The next prime is 21038114239. The reversal of 21038114221 is 12241183012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17730254025 + 3307860196 = 133155^2 + 57514^2 .

It is a cyclic number.

It is not a de Polignac number, because 21038114221 - 2⁷ = 21038114093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21038814221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519057110 + 10519057111.

It is an arithmetic number, because the mean of its divisors is an integer number (10519057111).

Almost surely, 2^21038114221 is an apocalyptic number.

It is an amenable number.

21038114221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038114221 is an equidigital number, since it uses as much as digits as its factorization.

21038114221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 21038114221 its reverse (12241183012), we get a palindrome (33279297233).

The spelling of 21038114221 in words is "twenty-one billion, thirty-eight million, one hundred fourteen thousand, two hundred twenty-one".