12601821 has 4 divisors (see below), whose sum is σ = 16802432. Its totient is φ = 8401212.

The previous prime is 12601819. The next prime is 12601847. The reversal of 12601821 is 12810621.

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 not a de Polignac number, because 12601821 - 2¹ = 12601819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12601891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100301 + ... + 2100306.

It is an arithmetic number, because the mean of its divisors is an integer number (4200608).

Almost surely, 2^12601821 is an apocalyptic number.

It is an amenable number.

12601821 is a deficient number, since it is larger than the sum of its proper divisors (4200611).

12601821 is an equidigital number, since it uses as much as digits as its factorization.

12601821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200610.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 12601821 is about 3549.9043649090. The cubic root of 12601821 is about 232.7078866751.

It can be divided in two parts, 1260 and 1821, that added together give a triangular number (3081 = T₇₈).

The spelling of 12601821 in words is "twelve million, six hundred one thousand, eight hundred twenty-one".