111354421021 has 2 divisors, whose sum is σ = 111354421022. Its totient is φ = 111354421020.

The previous prime is 111354421001. The next prime is 111354421033. The reversal of 111354421021 is 120124453111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103224693796 + 8129727225 = 321286^2 + 90165^2 .

It is a cyclic number.

It is not a de Polignac number, because 111354421021 - 2⁹ = 111354420509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111354421001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55677210510 + 55677210511.

It is an arithmetic number, because the mean of its divisors is an integer number (55677210511).

Almost surely, 2^111354421021 is an apocalyptic number.

It is an amenable number.

111354421021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111354421021 is an equidigital number, since it uses as much as digits as its factorization.

111354421021 is an evil number, because the sum of its binary digits is even.

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

Adding to 111354421021 its reverse (120124453111), we get a palindrome (231478874132).

The spelling of 111354421021 in words is "one hundred eleven billion, three hundred fifty-four million, four hundred twenty-one thousand, twenty-one".