1221153151397 has 2 divisors, whose sum is σ = 1221153151398. Its totient is φ = 1221153151396.

The previous prime is 1221153151373. The next prime is 1221153151429. The reversal of 1221153151397 is 7931513511221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177899966721 + 43253184676 = 1085311^2 + 207974^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221153151397 - 2²⁴ = 1221136374181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221153151357) 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, 610576575698 + 610576575699.

It is an arithmetic number, because the mean of its divisors is an integer number (610576575699).

Almost surely, 2^{1221153151397} is an apocalyptic number.

It is an amenable number.

1221153151397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221153151397 is an equidigital number, since it uses as much as digits as its factorization.

1221153151397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 41.

The spelling of 1221153151397 in words is "one trillion, two hundred twenty-one billion, one hundred fifty-three million, one hundred fifty-one thousand, three hundred ninety-seven".