13642421 has 8 divisors (see below), whose sum is σ = 14734104. Its totient is φ = 12556800.

The previous prime is 13642357. The next prime is 13642423. The reversal of 13642421 is 12424631.

It can be written as a sum of positive squares in 4 ways, for example, as 7761796 + 5880625 = 2786^2 + 2425^2 .

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 13642421 - 2⁶ = 13642357 is a prime.

It is a super-2 number, since 2×13642421² = 372231301482482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13642423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3905 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (1841763).

Almost surely, 2^13642421 is an apocalyptic number.

It is an amenable number.

13642421 is a deficient number, since it is larger than the sum of its proper divisors (1091683).

13642421 is a wasteful number, since it uses less digits than its factorization.

13642421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031.

The product of its digits is 1152, while the sum is 23.

The square root of 13642421 is about 3693.5648092324. The cubic root of 13642421 is about 238.9445609407.

The spelling of 13642421 in words is "thirteen million, six hundred forty-two thousand, four hundred twenty-one".