12612666621621 has 8 divisors (see below), whose sum is σ = 18345696904224. Its totient is φ = 7644040376720.

The previous prime is 12612666621619. The next prime is 12612666621623.

It is a happy number.

12612666621621 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (12612666621619) and next prime (12612666621623).

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

It is not a de Polignac number, because 12612666621621 - 2¹ = 12612666621619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12612666621623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191101009386 + ... + 191101009451.

It is an arithmetic number, because the mean of its divisors is an integer number (2293212113028).

Almost surely, 2^{12612666621621} is an apocalyptic number.

12612666621621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12612666621621 is a deficient number, since it is larger than the sum of its proper divisors (5733030282603).

12612666621621 is a wasteful number, since it uses less digits than its factorization.

12612666621621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382202018851.

The product of its digits is 746496, while the sum is 48.

It can be divided in two parts, 1261266 and 6621621, that added together give a palindrome (7882887).

The spelling of 12612666621621 in words is "twelve trillion, six hundred twelve billion, six hundred sixty-six million, six hundred twenty-one thousand, six hundred twenty-one".