333772721 has 2 divisors, whose sum is σ = 333772722. Its totient is φ = 333772720.

The previous prime is 333772661. The next prime is 333772729. The reversal of 333772721 is 127277333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332551696 + 1221025 = 18236^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 333772721 - 2⁶ = 333772657 is a prime.

It is a super-2 number, since 2×333772721² = 222808458567487682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (333772729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166886360 + 166886361.

It is an arithmetic number, because the mean of its divisors is an integer number (166886361).

Almost surely, 2^333772721 is an apocalyptic number.

It is an amenable number.

333772721 is a deficient number, since it is larger than the sum of its proper divisors (1).

333772721 is an equidigital number, since it uses as much as digits as its factorization.

333772721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044, while the sum is 35.

The square root of 333772721 is about 18269.4477475374. The cubic root of 333772721 is about 693.6657949797.

The spelling of 333772721 in words is "three hundred thirty-three million, seven hundred seventy-two thousand, seven hundred twenty-one".