21514466509 has 2 divisors, whose sum is σ = 21514466510. Its totient is φ = 21514466508.

The previous prime is 21514466489. The next prime is 21514466513. The reversal of 21514466509 is 90566441512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18490016484 + 3024450025 = 135978^2 + 54995^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514466509 - 2¹⁵ = 21514433741 is a prime.

It is a super-3 number, since 3×21514466509³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21514466579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757233254 + 10757233255.

It is an arithmetic number, because the mean of its divisors is an integer number (10757233255).

Almost surely, 2^21514466509 is an apocalyptic number.

It is an amenable number.

21514466509 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514466509 is an equidigital number, since it uses as much as digits as its factorization.

21514466509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 21514466509 in words is "twenty-one billion, five hundred fourteen million, four hundred sixty-six thousand, five hundred nine".