21014032421021 has 2 divisors, whose sum is σ = 21014032421022. Its totient is φ = 21014032421020.

The previous prime is 21014032421017. The next prime is 21014032421099. The reversal of 21014032421021 is 12012423041012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17313837780100 + 3700194640921 = 4160990^2 + 1923589^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014032421021 - 2² = 21014032421017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014032427021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507016210510 + 10507016210511.

It is an arithmetic number, because the mean of its divisors is an integer number (10507016210511).

Almost surely, 2^{21014032421021} is an apocalyptic number.

It is an amenable number.

21014032421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014032421021 is an equidigital number, since it uses as much as digits as its factorization.

21014032421021 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 23.

Adding to 21014032421021 its reverse (12012423041012), we get a palindrome (33026455462033).

The spelling of 21014032421021 in words is "twenty-one trillion, fourteen billion, thirty-two million, four hundred twenty-one thousand, twenty-one".