2121111899 has 2 divisors, whose sum is σ = 2121111900. Its totient is φ = 2121111898.

The previous prime is 2121111877. The next prime is 2121111907. The reversal of 2121111899 is 9981111212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121111899 - 2¹⁶ = 2121046363 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121111809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060555949 + 1060555950.

It is an arithmetic number, because the mean of its divisors is an integer number (1060555950).

Almost surely, 2^2121111899 is an apocalyptic number.

2121111899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121111899 is an equidigital number, since it uses as much as digits as its factorization.

2121111899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 35.

The square root of 2121111899 is about 46055.5306016552. The cubic root of 2121111899 is about 1284.8562066133.

It can be divided in two parts, 212 and 1111899, that added together give a palindrome (1112111).

The spelling of 2121111899 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, eight hundred ninety-nine".