13902221 has 2 divisors, whose sum is σ = 13902222. Its totient is φ = 13902220.

The previous prime is 13902211. The next prime is 13902233. The reversal of 13902221 is 12220931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 4818025 = 3014^2 + 2195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13902221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13902193 and 13902202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13902211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6951110 + 6951111.

It is an arithmetic number, because the mean of its divisors is an integer number (6951111).

Almost surely, 2^13902221 is an apocalyptic number.

It is an amenable number.

13902221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13902221 is an equidigital number, since it uses as much as digits as its factorization.

13902221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13902221 is about 3728.5682238629. The cubic root of 13902221 is about 240.4518167139.

The spelling of 13902221 in words is "thirteen million, nine hundred two thousand, two hundred twenty-one".