11121131261251 has 4 divisors (see below), whose sum is σ = 12132143194104. Its totient is φ = 10110119328400.

The previous prime is 11121131261159. The next prime is 11121131261281. The reversal of 11121131261251 is 15216213112111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11121131261251 - 2³³ = 11112541326659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121131261281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505505966410 + ... + 505505966431.

It is an arithmetic number, because the mean of its divisors is an integer number (3033035798526).

Almost surely, 2^{11121131261251} is an apocalyptic number.

11121131261251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11121131261251 is a deficient number, since it is larger than the sum of its proper divisors (1011011932853).

11121131261251 is a wasteful number, since it uses less digits than its factorization.

11121131261251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011011932852.

The product of its digits is 720, while the sum is 28.

Adding to 11121131261251 its reverse (15216213112111), we get a palindrome (26337344373362).

The spelling of 11121131261251 in words is "eleven trillion, one hundred twenty-one billion, one hundred thirty-one million, two hundred sixty-one thousand, two hundred fifty-one".