1200122100257 has 2 divisors, whose sum is σ = 1200122100258. Its totient is φ = 1200122100256.

The previous prime is 1200122100211. The next prime is 1200122100293. The reversal of 1200122100257 is 7520012210021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930744492001 + 269377608256 = 964751^2 + 519016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200122100257 - 2⁶ = 1200122100193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200122100157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600061050128 + 600061050129.

It is an arithmetic number, because the mean of its divisors is an integer number (600061050129).

Almost surely, 2^{1200122100257} is an apocalyptic number.

It is an amenable number.

1200122100257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200122100257 is an equidigital number, since it uses as much as digits as its factorization.

1200122100257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 1200122100257 its reverse (7520012210021), we get a palindrome (8720134310278).

The spelling of 1200122100257 in words is "one trillion, two hundred billion, one hundred twenty-two million, one hundred thousand, two hundred fifty-seven".