12622721 has 4 divisors (see below), whose sum is σ = 13365252. Its totient is φ = 11880192.

The previous prime is 12622681. The next prime is 12622739. The reversal of 12622721 is 12722621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12722621 = 107 ⋅118903.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 2131600 = 3239^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 12622721 - 2²² = 8428417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12622021) 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, 371240 + ... + 371273.

It is an arithmetic number, because the mean of its divisors is an integer number (3341313).

Almost surely, 2^12622721 is an apocalyptic number.

It is an amenable number.

12622721 is a deficient number, since it is larger than the sum of its proper divisors (742531).

12622721 is an equidigital number, since it uses as much as digits as its factorization.

12622721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742530.

The product of its digits is 672, while the sum is 23.

The square root of 12622721 is about 3552.8468866530. The cubic root of 12622721 is about 232.8364635574.

The spelling of 12622721 in words is "twelve million, six hundred twenty-two thousand, seven hundred twenty-one".