111271021 has 2 divisors, whose sum is σ = 111271022. Its totient is φ = 111271020.

The previous prime is 111270961. The next prime is 111271063. The reversal of 111271021 is 120172111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94575625 + 16695396 = 9725^2 + 4086^2 .

It is an emirp because it is prime and its reverse (120172111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111271021 - 2²⁵ = 77716589 is a prime.

It is a super-2 number, since 2×111271021² = 24762480228764882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111270986 and 111271004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111211021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55635510 + 55635511.

It is an arithmetic number, because the mean of its divisors is an integer number (55635511).

Almost surely, 2^111271021 is an apocalyptic number.

It is an amenable number.

111271021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111271021 is an equidigital number, since it uses as much as digits as its factorization.

111271021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 111271021 is about 10548.5079987646. The cubic root of 111271021 is about 480.9803761860.

The spelling of 111271021 in words is "one hundred eleven million, two hundred seventy-one thousand, twenty-one".