21214036503493 has 2 divisors, whose sum is σ = 21214036503494. Its totient is φ = 21214036503492.

The previous prime is 21214036503467. The next prime is 21214036503529. The reversal of 21214036503493 is 39430563041212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17543892462849 + 3670144040644 = 4188543^2 + 1915762^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214036503493 - 2¹⁷ = 21214036372421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214036503403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607018251746 + 10607018251747.

It is an arithmetic number, because the mean of its divisors is an integer number (10607018251747).

Almost surely, 2^{21214036503493} is an apocalyptic number.

It is an amenable number.

21214036503493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214036503493 is an equidigital number, since it uses as much as digits as its factorization.

21214036503493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 21214036503493 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred three thousand, four hundred ninety-three".