1221153151051 has 2 divisors, whose sum is σ = 1221153151052. Its totient is φ = 1221153151050.

The previous prime is 1221153151037. The next prime is 1221153151067. The reversal of 1221153151051 is 1501513511221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1501513511221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221153151051 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221153151451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610576575525 + 610576575526.

It is an arithmetic number, because the mean of its divisors is an integer number (610576575526).

Almost surely, 2^{1221153151051} is an apocalyptic number.

1221153151051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221153151051 is an equidigital number, since it uses as much as digits as its factorization.

1221153151051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 28.

Adding to 1221153151051 its reverse (1501513511221), we get a palindrome (2722666662272).

The spelling of 1221153151051 in words is "one trillion, two hundred twenty-one billion, one hundred fifty-three million, one hundred fifty-one thousand, fifty-one".