21515414332459 has 2 divisors, whose sum is σ = 21515414332460. Its totient is φ = 21515414332458.

The previous prime is 21515414332409. The next prime is 21515414332591. The reversal of 21515414332459 is 95423341451512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21515414332459 - 2⁹ = 21515414331947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21515414332409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757707166229 + 10757707166230.

It is an arithmetic number, because the mean of its divisors is an integer number (10757707166230).

Almost surely, 2^{21515414332459} is an apocalyptic number.

21515414332459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21515414332459 is an equidigital number, since it uses as much as digits as its factorization.

21515414332459 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 49.

The spelling of 21515414332459 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fourteen million, three hundred thirty-two thousand, four hundred fifty-nine".