1011121221157 has 2 divisors, whose sum is σ = 1011121221158. Its totient is φ = 1011121221156.

The previous prime is 1011121221031. The next prime is 1011121221161. The reversal of 1011121221157 is 7511221211101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1007963792676 + 3157428481 = 1003974^2 + 56191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011121221157 is a prime.

It is a super-2 number, since 2×1011121221157² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011121221857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505560610578 + 505560610579.

It is an arithmetic number, because the mean of its divisors is an integer number (505560610579).

Almost surely, 2^{1011121221157} is an apocalyptic number.

It is an amenable number.

1011121221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011121221157 is an equidigital number, since it uses as much as digits as its factorization.

1011121221157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 25.

Adding to 1011121221157 its reverse (7511221211101), we get a palindrome (8522342432258).

The spelling of 1011121221157 in words is "one trillion, eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred fifty-seven".