12611621 has 4 divisors (see below), whose sum is σ = 13758144. Its totient is φ = 11465100.

The previous prime is 12611617. The next prime is 12611623.

12611621 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 12611621 - 2² = 12611617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12611593 and 12611602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12611623) 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, 573245 + ... + 573266.

It is an arithmetic number, because the mean of its divisors is an integer number (3439536).

Almost surely, 2^12611621 is an apocalyptic number.

12611621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12611621 is a deficient number, since it is larger than the sum of its proper divisors (1146523).

12611621 is a wasteful number, since it uses less digits than its factorization.

12611621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146522.

The product of its digits is 144, while the sum is 20.

The square root of 12611621 is about 3551.2844155319. The cubic root of 12611621 is about 232.7681940011.

It can be divided in two parts, 1261 and 1621, that added together give a palindrome (2882).

The spelling of 12611621 in words is "twelve million, six hundred eleven thousand, six hundred twenty-one".