2100504861 has 24 divisors (see below), whose sum is σ = 3734232320. Its totient is φ = 1107958176.

The previous prime is 2100504859. The next prime is 2100504863. The reversal of 2100504861 is 1684050012.

It is an interprime number because it is at equal distance from previous prime (2100504859) and next prime (2100504863).

It is not a de Polignac number, because 2100504861 - 2¹ = 2100504859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100504863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1281541 + ... + 1283178.

Almost surely, 2^2100504861 is an apocalyptic number.

2100504861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2100504861 is a deficient number, since it is larger than the sum of its proper divisors (1633727459).

2100504861 is a wasteful number, since it uses less digits than its factorization.

2100504861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564745 (or 2564742 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 2100504861 is about 45831.2651036386. The cubic root of 2100504861 is about 1280.6817781105.

Adding to 2100504861 its reverse (1684050012), we get a palindrome (3784554873).

The spelling of 2100504861 in words is "two billion, one hundred million, five hundred four thousand, eight hundred sixty-one".