111002120921 has 2 divisors, whose sum is σ = 111002120922. Its totient is φ = 111002120920.

The previous prime is 111002120837. The next prime is 111002121017. The reversal of 111002120921 is 129021200111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110972265625 + 29855296 = 333125^2 + 5464^2 .

It is a cyclic number.

It is not a de Polignac number, because 111002120921 - 2²⁶ = 110935012057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111002120893 and 111002120902.

It is not a weakly prime, because it can be changed into another prime (111002120521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55501060460 + 55501060461.

It is an arithmetic number, because the mean of its divisors is an integer number (55501060461).

Almost surely, 2^111002120921 is an apocalyptic number.

It is an amenable number.

111002120921 is a deficient number, since it is larger than the sum of its proper divisors (1).

111002120921 is an equidigital number, since it uses as much as digits as its factorization.

111002120921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 111002120921 in words is "one hundred eleven billion, two million, one hundred twenty thousand, nine hundred twenty-one".