12621381 has 8 divisors (see below), whose sum is σ = 16854240. Its totient is φ = 8401392.

The previous prime is 12621379. The next prime is 12621391. The reversal of 12621381 is 18312621.

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

It is not a de Polignac number, because 12621381 - 2¹ = 12621379 is a prime.

It is a super-2 number, since 2×12621381² = 318598516694322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621391) 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, 630 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (2106780).

Almost surely, 2^12621381 is an apocalyptic number.

It is an amenable number.

12621381 is a deficient number, since it is larger than the sum of its proper divisors (4232859).

12621381 is an equidigital number, since it uses as much as digits as its factorization.

12621381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6435.

The product of its digits is 576, while the sum is 24.

The square root of 12621381 is about 3552.6583004843. The cubic root of 12621381 is about 232.8282241320.

The spelling of 12621381 in words is "twelve million, six hundred twenty-one thousand, three hundred eighty-one".