21514183409 has 2 divisors, whose sum is σ = 21514183410. Its totient is φ = 21514183408.

The previous prime is 21514183399. The next prime is 21514183433. The reversal of 21514183409 is 90438141512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11811342400 + 9702841009 = 108680^2 + 98503^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514183409 - 2²⁰ = 21513134833 is a prime.

It is a super-2 number, since 2×21514183409² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21514183309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757091704 + 10757091705.

It is an arithmetic number, because the mean of its divisors is an integer number (10757091705).

Almost surely, 2^21514183409 is an apocalyptic number.

It is an amenable number.

21514183409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514183409 is an equidigital number, since it uses as much as digits as its factorization.

21514183409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 21514183409 in words is "twenty-one billion, five hundred fourteen million, one hundred eighty-three thousand, four hundred nine".