21325131313018 has 16 divisors (see below), whose sum is σ = 34451925912936. Its totient is φ = 9841329192960.

The previous prime is 21325131312943. The next prime is 21325131313019. The reversal of 21325131313018 is 81031313152312.

It can be written as a sum of positive squares in 4 ways, for example, as 21110045917489 + 215085395529 = 4594567^2 + 463773^2 .

It is a super-2 number, since 2×21325131313018² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21325131313019) 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 7 ways as a sum of consecutive naturals, for example, 43045023 + ... + 43537618.

Almost surely, 2^{21325131313018} is an apocalyptic number.

21325131313018 is a deficient number, since it is larger than the sum of its proper divisors (13126794599918).

21325131313018 is a wasteful number, since it uses less digits than its factorization.

21325131313018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86592129.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 21325131313018 in words is "twenty-one trillion, three hundred twenty-five billion, one hundred thirty-one million, three hundred thirteen thousand, eighteen".