20110102157 has 2 divisors, whose sum is σ = 20110102158. Its totient is φ = 20110102156.

The previous prime is 20110102139. The next prime is 20110102241. The reversal of 20110102157 is 75120101102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15143517481 + 4966584676 = 123059^2 + 70474^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110102157 - 2⁸ = 20110101901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110102127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055051078 + 10055051079.

It is an arithmetic number, because the mean of its divisors is an integer number (10055051079).

Almost surely, 2^20110102157 is an apocalyptic number.

It is an amenable number.

20110102157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110102157 is an equidigital number, since it uses as much as digits as its factorization.

20110102157 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 20.

Adding to 20110102157 its reverse (75120101102), we get a palindrome (95230203259).

The spelling of 20110102157 in words is "twenty billion, one hundred ten million, one hundred two thousand, one hundred fifty-seven".