1200222021961 has 2 divisors, whose sum is σ = 1200222021962. Its totient is φ = 1200222021960.

The previous prime is 1200222021959. The next prime is 1200222022031. The reversal of 1200222021961 is 1691202220021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 691111231561 + 509110790400 = 831331^2 + 713520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200222021961 - 2¹ = 1200222021959 is a prime.

Together with 1200222021959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1200222021941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600111010980 + 600111010981.

It is an arithmetic number, because the mean of its divisors is an integer number (600111010981).

Almost surely, 2^{1200222021961} is an apocalyptic number.

It is an amenable number.

1200222021961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200222021961 is an equidigital number, since it uses as much as digits as its factorization.

1200222021961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 1200222021961 its reverse (1691202220021), we get a palindrome (2891424241982).

The spelling of 1200222021961 in words is "one trillion, two hundred billion, two hundred twenty-two million, twenty-one thousand, nine hundred sixty-one".