111021401 has 2 divisors, whose sum is σ = 111021402. Its totient is φ = 111021400.

The previous prime is 111021397. The next prime is 111021409. The reversal of 111021401 is 104120111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65593801 + 45427600 = 8099^2 + 6740^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021401 - 2² = 111021397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111021409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510700 + 55510701.

It is an arithmetic number, because the mean of its divisors is an integer number (55510701).

Almost surely, 2^111021401 is an apocalyptic number.

It is an amenable number.

111021401 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021401 is an equidigital number, since it uses as much as digits as its factorization.

111021401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 111021401 is about 10536.6693504162. The cubic root of 111021401 is about 480.6204375630.

Adding to 111021401 its reverse (104120111), we get a palindrome (215141512).

The spelling of 111021401 in words is "one hundred eleven million, twenty-one thousand, four hundred one".