120721331 has 2 divisors, whose sum is σ = 120721332. Its totient is φ = 120721330.

The previous prime is 120721297. The next prime is 120721357. The reversal of 120721331 is 133127021.

It is a strong prime.

It is an emirp because it is prime and its reverse (133127021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120721331 - 2¹⁸ = 120459187 is a prime.

It is a super-2 number, since 2×120721331² = 29147279516823122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (120727331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60360665 + 60360666.

It is an arithmetic number, because the mean of its divisors is an integer number (60360666).

Almost surely, 2^120721331 is an apocalyptic number.

120721331 is a deficient number, since it is larger than the sum of its proper divisors (1).

120721331 is an equidigital number, since it uses as much as digits as its factorization.

120721331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 120721331 is about 10987.3259258111. The cubic root of 120721331 is about 494.2287496385.

Adding to 120721331 its reverse (133127021), we get a palindrome (253848352).

The spelling of 120721331 in words is "one hundred twenty million, seven hundred twenty-one thousand, three hundred thirty-one".