10689421 has 2 divisors, whose sum is σ = 10689422. Its totient is φ = 10689420.

The previous prime is 10689391. The next prime is 10689431. The reversal of 10689421 is 12498601.

It is a happy number.

10689421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 4862025 = 2414^2 + 2205^2 .

It is an emirp because it is prime and its reverse (12498601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10689421 - 2⁷ = 10689293 is a prime.

It is a super-2 number, since 2×10689421² = 228527442630482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10689431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5344710 + 5344711.

It is an arithmetic number, because the mean of its divisors is an integer number (5344711).

Almost surely, 2^10689421 is an apocalyptic number.

It is an amenable number.

10689421 is a deficient number, since it is larger than the sum of its proper divisors (1).

10689421 is an equidigital number, since it uses as much as digits as its factorization.

10689421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 10689421 is about 3269.4679995375. The cubic root of 10689421 is about 220.2848994916.

The spelling of 10689421 in words is "ten million, six hundred eighty-nine thousand, four hundred twenty-one".