21514415455501 has 4 divisors (see below), whose sum is σ = 21517398190492. Its totient is φ = 21511432720512.

The previous prime is 21514415455483. The next prime is 21514415455517. The reversal of 21514415455501 is 10555451441512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14745208322601 + 6769207132900 = 3839949^2 + 2601770^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514415455501 - 2⁹ = 21514415454989 is a prime.

It is a super-2 number, since 2×21514415455501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514415455531) 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, 1491356676 + ... + 1491371101.

It is an arithmetic number, because the mean of its divisors is an integer number (5379349547623).

Almost surely, 2^{21514415455501} is an apocalyptic number.

It is an amenable number.

21514415455501 is a deficient number, since it is larger than the sum of its proper divisors (2982734991).

21514415455501 is an equidigital number, since it uses as much as digits as its factorization.

21514415455501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982734990.

The product of its (nonzero) digits is 400000, while the sum is 43.

The spelling of 21514415455501 in words is "twenty-one trillion, five hundred fourteen billion, four hundred fifteen million, four hundred fifty-five thousand, five hundred one".