111010999921 has 2 divisors, whose sum is σ = 111010999922. Its totient is φ = 111010999920.

The previous prime is 111010999909. The next prime is 111010999963. The reversal of 111010999921 is 129999010111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110982259600 + 28740321 = 333140^2 + 5361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111010999921 is a prime.

It is not a weakly prime, because it can be changed into another prime (111010999621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505499960 + 55505499961.

It is an arithmetic number, because the mean of its divisors is an integer number (55505499961).

Almost surely, 2^111010999921 is an apocalyptic number.

It is an amenable number.

111010999921 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010999921 is an equidigital number, since it uses as much as digits as its factorization.

111010999921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 111010999921 in words is "one hundred eleven billion, ten million, nine hundred ninety-nine thousand, nine hundred twenty-one".