21325131312985 has 8 divisors (see below), whose sum is σ = 25590185791560. Its totient is φ = 17060086239744.

The previous prime is 21325131312943. The next prime is 21325131313019. The reversal of 21325131312985 is 58921313152312.

It can be written as a sum of positive squares in 4 ways, for example, as 11433074726089 + 9892056586896 = 3381283^2 + 3145164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21325131312985 - 2⁷ = 21325131312857 is a prime.

It is a super-2 number, since 2×21325131312985² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4398121 + ... + 7873609.

It is an arithmetic number, because the mean of its divisors is an integer number (3198773223945).

Almost surely, 2^{21325131312985} is an apocalyptic number.

It is an amenable number.

21325131312985 is a deficient number, since it is larger than the sum of its proper divisors (4265054478575).

21325131312985 is a wasteful number, since it uses less digits than its factorization.

21325131312985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702667.

The product of its digits is 388800, while the sum is 46.

The spelling of 21325131312985 in words is "twenty-one trillion, three hundred twenty-five billion, one hundred thirty-one million, three hundred twelve thousand, nine hundred eighty-five".