111206420251 has 4 divisors (see below), whose sum is σ = 111888668392. Its totient is φ = 110524172112.

The previous prime is 111206420219. The next prime is 111206420257. The reversal of 111206420251 is 152024602111.

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 111206420251 - 2⁵ = 111206420219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111206420257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341123826 + ... + 341124151.

It is an arithmetic number, because the mean of its divisors is an integer number (27972167098).

Almost surely, 2^111206420251 is an apocalyptic number.

111206420251 is a deficient number, since it is larger than the sum of its proper divisors (682248141).

111206420251 is an equidigital number, since it uses as much as digits as its factorization.

111206420251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682248140.

The product of its (nonzero) digits is 960, while the sum is 25.

The spelling of 111206420251 in words is "one hundred eleven billion, two hundred six million, four hundred twenty thousand, two hundred fifty-one".