111110021641 has 2 divisors, whose sum is σ = 111110021642. Its totient is φ = 111110021640.

The previous prime is 111110021623. The next prime is 111110021651. The reversal of 111110021641 is 146120011111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82371296016 + 28738725625 = 287004^2 + 169525^2 .

It is a cyclic number.

It is not a de Polignac number, because 111110021641 - 2²⁹ = 110573150729 is a prime.

It is not a weakly prime, because it can be changed into another prime (111110021621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555010820 + 55555010821.

It is an arithmetic number, because the mean of its divisors is an integer number (55555010821).

Almost surely, 2^111110021641 is an apocalyptic number.

It is an amenable number.

111110021641 is a deficient number, since it is larger than the sum of its proper divisors (1).

111110021641 is an equidigital number, since it uses as much as digits as its factorization.

111110021641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 111110021641 its reverse (146120011111), we get a palindrome (257230032752).

The spelling of 111110021641 in words is "one hundred eleven billion, one hundred ten million, twenty-one thousand, six hundred forty-one".