1200121112251 has 2 divisors, whose sum is σ = 1200121112252. Its totient is φ = 1200121112250.

The previous prime is 1200121112249. The next prime is 1200121112261. The reversal of 1200121112251 is 1522111210021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200121112251 - 2¹ = 1200121112249 is a prime.

Together with 1200121112249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1200121112261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600060556125 + 600060556126.

It is an arithmetic number, because the mean of its divisors is an integer number (600060556126).

Almost surely, 2^{1200121112251} is an apocalyptic number.

1200121112251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200121112251 is an equidigital number, since it uses as much as digits as its factorization.

1200121112251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 1200121112251 its reverse (1522111210021), we get a palindrome (2722232322272).

The spelling of 1200121112251 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred twelve thousand, two hundred fifty-one".