21214036536659 has 4 divisors (see below), whose sum is σ = 21264426172560. Its totient is φ = 21163646900760.

The previous prime is 21214036536617. The next prime is 21214036536677. The reversal of 21214036536659 is 95663563041212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21214036536659 - 2⁸ = 21214036536403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21214036536659.

It is not an unprimeable number, because it can be changed into a prime (21214036536689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25194817319 + ... + 25194818160.

It is an arithmetic number, because the mean of its divisors is an integer number (5316106543140).

Almost surely, 2^{21214036536659} is an apocalyptic number.

21214036536659 is a deficient number, since it is larger than the sum of its proper divisors (50389635901).

21214036536659 is an equidigital number, since it uses as much as digits as its factorization.

21214036536659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50389635900.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 21214036536659 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred fifty-nine".