67231921 has 4 divisors (see below), whose sum is σ = 70155072. Its totient is φ = 64308772.

The previous prime is 67231897. The next prime is 67231981. The reversal of 67231921 is 12913276.

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 67231921 - 2¹⁷ = 67100849 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67231981) 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, 1461541 + ... + 1461586.

It is an arithmetic number, because the mean of its divisors is an integer number (17538768).

Almost surely, 2^67231921 is an apocalyptic number.

It is an amenable number.

67231921 is a deficient number, since it is larger than the sum of its proper divisors (2923151).

67231921 is a wasteful number, since it uses less digits than its factorization.

67231921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923150.

The product of its digits is 4536, while the sum is 31.

The square root of 67231921 is about 8199.5073632506. The cubic root of 67231921 is about 406.6229063217.

The spelling of 67231921 in words is "sixty-seven million, two hundred thirty-one thousand, nine hundred twenty-one".