20121001157 has 2 divisors, whose sum is σ = 20121001158. Its totient is φ = 20121001156.

The previous prime is 20121001111. The next prime is 20121001177. The reversal of 20121001157 is 75110012102.

It is a happy number.

It is an a-pointer prime, because the next prime (20121001177) can be obtained adding 20121001157 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11733005761 + 8387995396 = 108319^2 + 91586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121001157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121001177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060500578 + 10060500579.

It is an arithmetic number, because the mean of its divisors is an integer number (10060500579).

Almost surely, 2^20121001157 is an apocalyptic number.

It is an amenable number.

20121001157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121001157 is an equidigital number, since it uses as much as digits as its factorization.

20121001157 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 20121001157 its reverse (75110012102), we get a palindrome (95231013259).

The spelling of 20121001157 in words is "twenty billion, one hundred twenty-one million, one thousand, one hundred fifty-seven".