67721233 has 2 divisors, whose sum is σ = 67721234. Its totient is φ = 67721232.

The previous prime is 67721231. The next prime is 67721273. The reversal of 67721233 is 33212776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67125249 + 595984 = 8193^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 67721233 - 2¹ = 67721231 is a prime.

Together with 67721231, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 67721195 and 67721204.

It is not a weakly prime, because it can be changed into another prime (67721231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860616 + 33860617.

It is an arithmetic number, because the mean of its divisors is an integer number (33860617).

Almost surely, 2^67721233 is an apocalyptic number.

It is an amenable number.

67721233 is a deficient number, since it is larger than the sum of its proper divisors (1).

67721233 is an equidigital number, since it uses as much as digits as its factorization.

67721233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 31.

The square root of 67721233 is about 8229.2911602397. The cubic root of 67721233 is about 407.6069860986.

The spelling of 67721233 in words is "sixty-seven million, seven hundred twenty-one thousand, two hundred thirty-three".