2101021983 has 12 divisors (see below), whose sum is σ = 3147210248. Its totient is φ = 1400681160.

The previous prime is 2101021943. The next prime is 2101022029. The reversal of 2101021983 is 3891201012.

It is not a de Polignac number, because 2101021983 - 2¹⁸ = 2100759839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101021943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4322848 + ... + 4323333.

Almost surely, 2^2101021983 is an apocalyptic number.

2101021983 is a deficient number, since it is larger than the sum of its proper divisors (1046188265).

2101021983 is an frugal number, since it uses more digits than its factorization.

2101021983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646196 (or 8646184 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2101021983 is about 45836.9063419424. The cubic root of 2101021983 is about 1280.7868662403.

Adding to 2101021983 its reverse (3891201012), we get a palindrome (5992222995).

The spelling of 2101021983 in words is "two billion, one hundred one million, twenty-one thousand, nine hundred eighty-three".