21002011111157 has 2 divisors, whose sum is σ = 21002011111158. Its totient is φ = 21002011111156.

The previous prime is 21002011111087. The next prime is 21002011111181. The reversal of 21002011111157 is 75111111020012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348259252081 + 8653751859076 = 3514009^2 + 2941726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002011111157 - 2¹⁴ = 21002011094773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002011111657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501005555578 + 10501005555579.

It is an arithmetic number, because the mean of its divisors is an integer number (10501005555579).

Almost surely, 2^{21002011111157} is an apocalyptic number.

It is an amenable number.

21002011111157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002011111157 is an equidigital number, since it uses as much as digits as its factorization.

21002011111157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 23.

Adding to 21002011111157 its reverse (75111111020012), we get a palindrome (96113122131169).

The spelling of 21002011111157 in words is "twenty-one trillion, two billion, eleven million, one hundred eleven thousand, one hundred fifty-seven".