20112021157 has 2 divisors, whose sum is σ = 20112021158. Its totient is φ = 20112021156.

The previous prime is 20112021119. The next prime is 20112021161. The reversal of 20112021157 is 75112021102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15613502116 + 4498519041 = 124954^2 + 67071^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112021157 - 2⁷ = 20112021029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112021197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056010578 + 10056010579.

It is an arithmetic number, because the mean of its divisors is an integer number (10056010579).

Almost surely, 2^20112021157 is an apocalyptic number.

It is an amenable number.

20112021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112021157 is an equidigital number, since it uses as much as digits as its factorization.

20112021157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 22.

Adding to 20112021157 its reverse (75112021102), we get a palindrome (95224042259).

Subtracting 20112021157 from its reverse (75112021102), we obtain a palindrome (54999999945).

The spelling of 20112021157 in words is "twenty billion, one hundred twelve million, twenty-one thousand, one hundred fifty-seven".