21321011431469 has 2 divisors, whose sum is σ = 21321011431470. Its totient is φ = 21321011431468.

The previous prime is 21321011431463. The next prime is 21321011431471. The reversal of 21321011431469 is 96413411012312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20227236400900 + 1093775030569 = 4497470^2 + 1045837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321011431469 is a prime.

It is a super-2 number, since 2×21321011431469² (a number of 27 digits) contains 22 as substring.

Together with 21321011431471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321011431463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660505715734 + 10660505715735.

It is an arithmetic number, because the mean of its divisors is an integer number (10660505715735).

Almost surely, 2^{21321011431469} is an apocalyptic number.

It is an amenable number.

21321011431469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321011431469 is an equidigital number, since it uses as much as digits as its factorization.

21321011431469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 21321011431469 in words is "twenty-one trillion, three hundred twenty-one billion, eleven million, four hundred thirty-one thousand, four hundred sixty-nine".