12641533514621 has 4 divisors (see below), whose sum is σ = 13790763834144. Its totient is φ = 11492303195100.

The previous prime is 12641533514611. The next prime is 12641533514633.

12641533514621 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12641533514621 - 2¹⁸ = 12641533252477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641533514611) 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, 574615159745 + ... + 574615159766.

It is an arithmetic number, because the mean of its divisors is an integer number (3447690958536).

Almost surely, 2^{12641533514621} is an apocalyptic number.

12641533514621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12641533514621 is a deficient number, since it is larger than the sum of its proper divisors (1149230319523).

12641533514621 is a wasteful number, since it uses less digits than its factorization.

12641533514621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149230319522.

The product of its digits is 518400, while the sum is 44.

It can be divided in two parts, 1264153 and 3514621, that added together give a palindrome (4778774).

The spelling of 12641533514621 in words is "twelve trillion, six hundred forty-one billion, five hundred thirty-three million, five hundred fourteen thousand, six hundred twenty-one".