21024454152313 has 4 divisors (see below), whose sum is σ = 21024520440228. Its totient is φ = 21024387864400.

The previous prime is 21024454152263. The next prime is 21024454152341. The reversal of 21024454152313 is 31325145442012.

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 11251408993344 + 9773045158969 = 3354312^2 + 3126187^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024454152313 - 2²⁵ = 21024420597881 is a prime.

It is a super-2 number, since 2×21024454152313² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21024454152113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32665906 + ... + 33303307.

It is an arithmetic number, because the mean of its divisors is an integer number (5256130110057).

Almost surely, 2^{21024454152313} is an apocalyptic number.

It is an amenable number.

21024454152313 is a deficient number, since it is larger than the sum of its proper divisors (66287915).

21024454152313 is an equidigital number, since it uses as much as digits as its factorization.

21024454152313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66287914.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 21024454152313 its reverse (31325145442012), we get a palindrome (52349599594325).

The spelling of 21024454152313 in words is "twenty-one trillion, twenty-four billion, four hundred fifty-four million, one hundred fifty-two thousand, three hundred thirteen".