1221065153122 has 4 divisors (see below), whose sum is σ = 1831597729686. Its totient is φ = 610532576560.

The previous prime is 1221065153111. The next prime is 1221065153129. The reversal of 1221065153122 is 2213515601221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 985868282281 + 235196870841 = 992909^2 + 484971^2 .

It is not an unprimeable number, because it can be changed into a prime (1221065153129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305266288279 + ... + 305266288282.

Almost surely, 2^{1221065153122} is an apocalyptic number.

1221065153122 is a deficient number, since it is larger than the sum of its proper divisors (610532576564).

1221065153122 is an equidigital number, since it uses as much as digits as its factorization.

1221065153122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610532576563.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 1221065153122 in words is "one trillion, two hundred twenty-one billion, sixty-five million, one hundred fifty-three thousand, one hundred twenty-two".