12624821 has 4 divisors (see below), whose sum is σ = 13772544. Its totient is φ = 11477100.

The previous prime is 12624817. The next prime is 12624847. The reversal of 12624821 is 12842621.

It is a happy number.

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 12624821 - 2² = 12624817 is a prime.

It is a super-2 number, since 2×12624821² = 318772210564082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12624221) 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, 573845 + ... + 573866.

It is an arithmetic number, because the mean of its divisors is an integer number (3443136).

Almost surely, 2^12624821 is an apocalyptic number.

12624821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12624821 is a deficient number, since it is larger than the sum of its proper divisors (1147723).

12624821 is a wasteful number, since it uses less digits than its factorization.

12624821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147722.

The product of its digits is 1536, while the sum is 26.

The square root of 12624821 is about 3553.1424120066. The cubic root of 12624821 is about 232.8493749167.

The spelling of 12624821 in words is "twelve million, six hundred twenty-four thousand, eight hundred twenty-one".