13621621 has 8 divisors (see below), whose sum is σ = 14805560. Its totient is φ = 12457152.

The previous prime is 13621603. The next prime is 13621627. The reversal of 13621621 is 12612631.

It can be written as a sum of positive squares in 4 ways, for example, as 5130225 + 8491396 = 2265^2 + 2914^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13621621 - 2⁹ = 13621109 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 13621592 and 13621601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13621627) 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, 3390 + ... + 6223.

It is an arithmetic number, because the mean of its divisors is an integer number (1850695).

Almost surely, 2^13621621 is an apocalyptic number.

It is an amenable number.

13621621 is a deficient number, since it is larger than the sum of its proper divisors (1183939).

13621621 is a wasteful number, since it uses less digits than its factorization.

13621621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9735.

The product of its digits is 432, while the sum is 22.

The square root of 13621621 is about 3690.7480271620. The cubic root of 13621621 is about 238.8230630804.

The spelling of 13621621 in words is "thirteen million, six hundred twenty-one thousand, six hundred twenty-one".