13345621 has 2 divisors, whose sum is σ = 13345622. Its totient is φ = 13345620.

The previous prime is 13345613. The next prime is 13345643. The reversal of 13345621 is 12654331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 2528100 = 3289^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 13345621 - 2³ = 13345613 is a prime.

It is equal to p₈₇₀₂₇₁ and since 13345621 and 870271 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13345421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6672810 + 6672811.

It is an arithmetic number, because the mean of its divisors is an integer number (6672811).

Almost surely, 2^13345621 is an apocalyptic number.

It is an amenable number.

13345621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13345621 is an equidigital number, since it uses as much as digits as its factorization.

13345621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 13345621 is about 3653.1658872819. The cubic root of 13345621 is about 237.1990411328.

Adding to 13345621 its reverse (12654331), we get a palindrome (25999952).

It can be divided in two parts, 133 and 45621, that added together give a palindrome (45754).

The spelling of 13345621 in words is "thirteen million, three hundred forty-five thousand, six hundred twenty-one".