2111021009989 has 2 divisors, whose sum is σ = 2111021009990. Its totient is φ = 2111021009988.

The previous prime is 2111021009969. The next prime is 2111021010013. The reversal of 2111021009989 is 9899001201112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1619045021889 + 491975988100 = 1272417^2 + 701410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111021009989 is a prime.

It is a super-2 number, since 2×2111021009989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111021009969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055510504994 + 1055510504995.

It is an arithmetic number, because the mean of its divisors is an integer number (1055510504995).

Almost surely, 2^{2111021009989} is an apocalyptic number.

It is an amenable number.

2111021009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111021009989 is an equidigital number, since it uses as much as digits as its factorization.

2111021009989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 43.

The spelling of 2111021009989 in words is "two trillion, one hundred eleven billion, twenty-one million, nine thousand, nine hundred eighty-nine".