13606421 has 2 divisors, whose sum is σ = 13606422. Its totient is φ = 13606420.

The previous prime is 13606393. The next prime is 13606457. The reversal of 13606421 is 12460631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 2788900 = 3289^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 13606421 - 2¹⁴ = 13590037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13606471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6803210 + 6803211.

It is an arithmetic number, because the mean of its divisors is an integer number (6803211).

Almost surely, 2^13606421 is an apocalyptic number.

It is an amenable number.

13606421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13606421 is an equidigital number, since it uses as much as digits as its factorization.

13606421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13606421 is about 3688.6882492290. The cubic root of 13606421 is about 238.7341979436.

The spelling of 13606421 in words is "thirteen million, six hundred six thousand, four hundred twenty-one".