20110101257 has 2 divisors, whose sum is σ = 20110101258. Its totient is φ = 20110101256.

The previous prime is 20110101241. The next prime is 20110101281. The reversal of 20110101257 is 75210101102.

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., 19897641481 + 212459776 = 141059^2 + 14576^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110101257 - 2⁴ = 20110101241 is a prime.

It is not a weakly prime, because it can be changed into another prime (20110101217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055050628 + 10055050629.

It is an arithmetic number, because the mean of its divisors is an integer number (10055050629).

Almost surely, 2^20110101257 is an apocalyptic number.

It is an amenable number.

20110101257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110101257 is an equidigital number, since it uses as much as digits as its factorization.

20110101257 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 20110101257 its reverse (75210101102), we get a palindrome (95320202359).

The spelling of 20110101257 in words is "twenty billion, one hundred ten million, one hundred one thousand, two hundred fifty-seven".