12111021257 has 2 divisors, whose sum is σ = 12111021258. Its totient is φ = 12111021256.

The previous prime is 12111021253. The next prime is 12111021269. The reversal of 12111021257 is 75212011121.

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., 9655224121 + 2455797136 = 98261^2 + 49556^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111021257 - 2² = 12111021253 is a prime.

It is not a weakly prime, because it can be changed into another prime (12111021253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055510628 + 6055510629.

It is an arithmetic number, because the mean of its divisors is an integer number (6055510629).

Almost surely, 2^12111021257 is an apocalyptic number.

It is an amenable number.

12111021257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111021257 is an equidigital number, since it uses as much as digits as its factorization.

12111021257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 12111021257 its reverse (75212011121), we get a palindrome (87323032378).

The spelling of 12111021257 in words is "twelve billion, one hundred eleven million, twenty-one thousand, two hundred fifty-seven".