21214111469 has 2 divisors, whose sum is σ = 21214111470. Its totient is φ = 21214111468.

The previous prime is 21214111427. The next prime is 21214111493. The reversal of 21214111469 is 96411141212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19478389225 + 1735722244 = 139565^2 + 41662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214111469 - 2²⁴ = 21197334253 is a prime.

It is a super-2 number, since 2×21214111469² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214111769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607055734 + 10607055735.

It is an arithmetic number, because the mean of its divisors is an integer number (10607055735).

Almost surely, 2^21214111469 is an apocalyptic number.

It is an amenable number.

21214111469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214111469 is an equidigital number, since it uses as much as digits as its factorization.

21214111469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The spelling of 21214111469 in words is "twenty-one billion, two hundred fourteen million, one hundred eleven thousand, four hundred sixty-nine".