67420121 has 4 divisors (see below), whose sum is σ = 67436544. Its totient is φ = 67403700.

The previous prime is 67420117. The next prime is 67420127. The reversal of 67420121 is 12102476.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 67420121 - 2² = 67420117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67420127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4076 + ... + 12306.

It is an arithmetic number, because the mean of its divisors is an integer number (16859136).

Almost surely, 2^67420121 is an apocalyptic number.

It is an amenable number.

67420121 is a deficient number, since it is larger than the sum of its proper divisors (16423).

67420121 is an equidigital number, since it uses as much as digits as its factorization.

67420121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16422.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 67420121 is about 8210.9756423948. The cubic root of 67420121 is about 407.0019680072.

Adding to 67420121 its reverse (12102476), we get a palindrome (79522597).

The spelling of 67420121 in words is "sixty-seven million, four hundred twenty thousand, one hundred twenty-one".