67149421 has 4 divisors (see below), whose sum is σ = 67662144. Its totient is φ = 66636700.

The previous prime is 67149403. The next prime is 67149437. The reversal of 67149421 is 12494176.

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 67149421 - 2⁵ = 67149389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67149451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256165 + ... + 256426.

It is an arithmetic number, because the mean of its divisors is an integer number (16915536).

Almost surely, 2^67149421 is an apocalyptic number.

It is an amenable number.

67149421 is a deficient number, since it is larger than the sum of its proper divisors (512723).

67149421 is a wasteful number, since it uses less digits than its factorization.

67149421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512722.

The product of its digits is 12096, while the sum is 34.

The square root of 67149421 is about 8194.4750289448. The cubic root of 67149421 is about 406.4565165068.

The spelling of 67149421 in words is "sixty-seven million, one hundred forty-nine thousand, four hundred twenty-one".