120311621 has 2 divisors, whose sum is σ = 120311622. Its totient is φ = 120311620.

The previous prime is 120311603. The next prime is 120311623. The reversal of 120311621 is 126113021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120143521 + 168100 = 10961^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 120311621 - 2⁶ = 120311557 is a prime.

It is a super-2 number, since 2×120311621² = 28949772295295282, which contains 22 as substring.

Together with 120311623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120311621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120311623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60155810 + 60155811.

It is an arithmetic number, because the mean of its divisors is an integer number (60155811).

Almost surely, 2^120311621 is an apocalyptic number.

It is an amenable number.

120311621 is a deficient number, since it is larger than the sum of its proper divisors (1).

120311621 is an equidigital number, since it uses as much as digits as its factorization.

120311621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 120311621 is about 10968.6654156283. The cubic root of 120311621 is about 493.6690033029.

Adding to 120311621 its reverse (126113021), we get a palindrome (246424642).

The spelling of 120311621 in words is "one hundred twenty million, three hundred eleven thousand, six hundred twenty-one".