11709421 has 2 divisors, whose sum is σ = 11709422. Its totient is φ = 11709420.

The previous prime is 11709409. The next prime is 11709443. The reversal of 11709421 is 12490711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10530025 + 1179396 = 3245^2 + 1086^2 .

It is an emirp because it is prime and its reverse (12490711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11709421 - 2⁷ = 11709293 is a prime.

It is a super-2 number, since 2×11709421² = 274221080310482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11703421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5854710 + 5854711.

It is an arithmetic number, because the mean of its divisors is an integer number (5854711).

Almost surely, 2^11709421 is an apocalyptic number.

It is an amenable number.

11709421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11709421 is an equidigital number, since it uses as much as digits as its factorization.

11709421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 11709421 is about 3421.9031254552. The cubic root of 11709421 is about 227.0797846166.

The spelling of 11709421 in words is "eleven million, seven hundred nine thousand, four hundred twenty-one".