120021907 has 2 divisors, whose sum is σ = 120021908. Its totient is φ = 120021906.

The previous prime is 120021893. The next prime is 120021911. The reversal of 120021907 is 709120021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 120021907 - 2⁷ = 120021779 is a prime.

It is not a weakly prime, because it can be changed into another prime (120021977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010953 + 60010954.

It is an arithmetic number, because the mean of its divisors is an integer number (60010954).

Almost surely, 2^120021907 is an apocalyptic number.

120021907 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021907 is an equidigital number, since it uses as much as digits as its factorization.

120021907 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 22.

The square root of 120021907 is about 10955.4510176441. The cubic root of 120021907 is about 493.2724282108.

Adding to 120021907 its reverse (709120021), we get a palindrome (829141928).

The spelling of 120021907 in words is "one hundred twenty million, twenty-one thousand, nine hundred seven".