20111214157 has 2 divisors, whose sum is σ = 20111214158. Its totient is φ = 20111214156.

The previous prime is 20111214143. The next prime is 20111214223. The reversal of 20111214157 is 75141211102.

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., 10858890436 + 9252323721 = 104206^2 + 96189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111214157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111214757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055607078 + 10055607079.

It is an arithmetic number, because the mean of its divisors is an integer number (10055607079).

Almost surely, 2^20111214157 is an apocalyptic number.

It is an amenable number.

20111214157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111214157 is an equidigital number, since it uses as much as digits as its factorization.

20111214157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 20111214157 its reverse (75141211102), we get a palindrome (95252425259).

The spelling of 20111214157 in words is "twenty billion, one hundred eleven million, two hundred fourteen thousand, one hundred fifty-seven".