21214036536349 has 2 divisors, whose sum is σ = 21214036536350. Its totient is φ = 21214036536348.

The previous prime is 21214036536257. The next prime is 21214036536401. The reversal of 21214036536349 is 94363563041212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20410426484100 + 803610052249 = 4517790^2 + 896443^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214036536349 - 2¹⁷ = 21214036405277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214036536449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607018268174 + 10607018268175.

It is an arithmetic number, because the mean of its divisors is an integer number (10607018268175).

Almost surely, 2^{21214036536349} is an apocalyptic number.

It is an amenable number.

21214036536349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214036536349 is an equidigital number, since it uses as much as digits as its factorization.

21214036536349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 49.

The spelling of 21214036536349 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, three hundred forty-nine".