13421917 has 2 divisors, whose sum is σ = 13421918. Its totient is φ = 13421916.

The previous prime is 13421897. The next prime is 13421927. The reversal of 13421917 is 71912431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9603801 + 3818116 = 3099^2 + 1954^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13421917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13421927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6710958 + 6710959.

It is an arithmetic number, because the mean of its divisors is an integer number (6710959).

Almost surely, 2^13421917 is an apocalyptic number.

It is an amenable number.

13421917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13421917 is an equidigital number, since it uses as much as digits as its factorization.

13421917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 13421917 is about 3663.5934545198. The cubic root of 13421917 is about 237.6501993586.

The spelling of 13421917 in words is "thirteen million, four hundred twenty-one thousand, nine hundred seventeen".