116666421 has 4 divisors (see below), whose sum is σ = 155555232. Its totient is φ = 77777612.

The previous prime is 116666411. The next prime is 116666437. The reversal of 116666421 is 124666611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 116666421 - 2⁶ = 116666357 is a prime.

It is a super-2 number, since 2×116666421² = 27222107577898482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116666401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19444401 + ... + 19444406.

It is an arithmetic number, because the mean of its divisors is an integer number (38888808).

Almost surely, 2^116666421 is an apocalyptic number.

It is an amenable number.

116666421 is a deficient number, since it is larger than the sum of its proper divisors (38888811).

116666421 is an equidigital number, since it uses as much as digits as its factorization.

116666421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38888810.

The product of its digits is 10368, while the sum is 33.

The square root of 116666421 is about 10801.2231251836. The cubic root of 116666421 is about 488.6320599858.

The spelling of 116666421 in words is "one hundred sixteen million, six hundred sixty-six thousand, four hundred twenty-one".