2102021847 has 40 divisors (see below), whose sum is σ = 3249663120. Its totient is φ = 1353179520.

The previous prime is 2102021833. The next prime is 2102021869. The reversal of 2102021847 is 7481202012.

It is not a de Polignac number, because 2102021847 - 2⁶ = 2102021783 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2102021847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102021897) 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 39 ways as a sum of consecutive naturals, for example, 306597 + ... + 313377.

It is an arithmetic number, because the mean of its divisors is an integer number (81241578).

Almost surely, 2^2102021847 is an apocalyptic number.

2102021847 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2102021847 is a deficient number, since it is larger than the sum of its proper divisors (1147641273).

2102021847 is an equidigital number, since it uses as much as digits as its factorization.

2102021847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925 (or 6916 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 2102021847 is about 45847.8118016553. The cubic root of 2102021847 is about 1280.9900069972.

Adding to 2102021847 its reverse (7481202012), we get a palindrome (9583223859).

The spelling of 2102021847 in words is "two billion, one hundred two million, twenty-one thousand, eight hundred forty-seven".