33721973 has 2 divisors, whose sum is σ = 33721974. Its totient is φ = 33721972.

The previous prime is 33721969. The next prime is 33721991. The reversal of 33721973 is 37912733.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27952369 + 5769604 = 5287^2 + 2402^2 .

It is a cyclic number.

It is not a de Polignac number, because 33721973 - 2² = 33721969 is a prime.

It is a super-2 number, since 2×33721973² = 2274342926025458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33721993) 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 as a sum of consecutive naturals, namely, 16860986 + 16860987.

It is an arithmetic number, because the mean of its divisors is an integer number (16860987).

Almost surely, 2^33721973 is an apocalyptic number.

It is an amenable number.

33721973 is a deficient number, since it is larger than the sum of its proper divisors (1).

33721973 is an equidigital number, since it uses as much as digits as its factorization.

33721973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 35.

The square root of 33721973 is about 5807.0623382223. The cubic root of 33721973 is about 323.0757234112.

The spelling of 33721973 in words is "thirty-three million, seven hundred twenty-one thousand, nine hundred seventy-three".