20102100157 has 2 divisors, whose sum is σ = 20102100158. Its totient is φ = 20102100156.

The previous prime is 20102100121. The next prime is 20102100167. The reversal of 20102100157 is 75100120102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19047864196 + 1054235961 = 138014^2 + 32469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102100157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102100167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051050078 + 10051050079.

It is an arithmetic number, because the mean of its divisors is an integer number (10051050079).

Almost surely, 2^20102100157 is an apocalyptic number.

It is an amenable number.

20102100157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102100157 is an equidigital number, since it uses as much as digits as its factorization.

20102100157 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 19.

Adding to 20102100157 its reverse (75100120102), we get a palindrome (95202220259).

The spelling of 20102100157 in words is "twenty billion, one hundred two million, one hundred thousand, one hundred fifty-seven".