21214036536449 has 2 divisors, whose sum is σ = 21214036536450. Its totient is φ = 21214036536448.

The previous prime is 21214036536403. The next prime is 21214036536487. The reversal of 21214036536449 is 94463563041212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19939975776400 + 1274060760049 = 4465420^2 + 1128743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214036536449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21214036536397 and 21214036536406.

It is not a weakly prime, because it can be changed into another prime (21214036536349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607018268224 + 10607018268225.

It is an arithmetic number, because the mean of its divisors is an integer number (10607018268225).

Almost surely, 2^{21214036536449} is an apocalyptic number.

It is an amenable number.

21214036536449 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214036536449 is an equidigital number, since it uses as much as digits as its factorization.

21214036536449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 21214036536449 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred forty-nine".