120221221957 has 2 divisors, whose sum is σ = 120221221958. Its totient is φ = 120221221956.

The previous prime is 120221221949. The next prime is 120221221961. The reversal of 120221221957 is 759122122021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116985204961 + 3236016996 = 342031^2 + 56886^2 .

It is a cyclic number.

It is not a de Polignac number, because 120221221957 - 2³ = 120221221949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120221221907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60110610978 + 60110610979.

It is an arithmetic number, because the mean of its divisors is an integer number (60110610979).

Almost surely, 2^120221221957 is an apocalyptic number.

It is an amenable number.

120221221957 is a deficient number, since it is larger than the sum of its proper divisors (1).

120221221957 is an equidigital number, since it uses as much as digits as its factorization.

120221221957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

Adding to 120221221957 its reverse (759122122021), we get a palindrome (879343343978).

The spelling of 120221221957 in words is "one hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, nine hundred fifty-seven".