13622921 has 12 divisors (see below), whose sum is σ = 14877900. Its totient is φ = 12467520.

The previous prime is 13622897. The next prime is 13622977. The reversal of 13622921 is 12922631.

It can be written as a sum of positive squares in 6 ways, for example, as 5125696 + 8497225 = 2264^2 + 2915^2 .

It is not a de Polignac number, because 13622921 - 2¹⁸ = 13360777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13621921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24911 + ... + 25451.

It is an arithmetic number, because the mean of its divisors is an integer number (1239825).

Almost surely, 2^13622921 is an apocalyptic number.

It is an amenable number.

13622921 is a deficient number, since it is larger than the sum of its proper divisors (1254979).

13622921 is a wasteful number, since it uses less digits than its factorization.

13622921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 703 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 13622921 is about 3690.9241390199. The cubic root of 13622921 is about 238.8306603188.

The spelling of 13622921 in words is "thirteen million, six hundred twenty-two thousand, nine hundred twenty-one".