13898221 has 8 divisors (see below), whose sum is σ = 14729400. Its totient is φ = 13090560.

The previous prime is 13898219. The next prime is 13898237. The reversal of 13898221 is 12289831.

13898221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2842596 + 11055625 = 1686^2 + 3325^2 .

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 13898221 - 2¹ = 13898219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13298221) 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, 4656 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (1841175).

Almost surely, 2^13898221 is an apocalyptic number.

It is an amenable number.

13898221 is a deficient number, since it is larger than the sum of its proper divisors (831179).

13898221 is a wasteful number, since it uses less digits than its factorization.

13898221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11759.

The product of its digits is 6912, while the sum is 34.

The square root of 13898221 is about 3728.0317863452. The cubic root of 13898221 is about 240.4287532641.

The spelling of 13898221 in words is "thirteen million, eight hundred ninety-eight thousand, two hundred twenty-one".