2102131405 has 32 divisors (see below), whose sum is σ = 2901749760. Its totient is φ = 1445843520.

The previous prime is 2102131403. The next prime is 2102131441. The reversal of 2102131405 is 5041312012.

It is not a de Polignac number, because 2102131405 - 2¹ = 2102131403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102131403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 758332 + ... + 761098.

It is an arithmetic number, because the mean of its divisors is an integer number (90679680).

Almost surely, 2^2102131405 is an apocalyptic number.

It is an amenable number.

2102131405 is a deficient number, since it is larger than the sum of its proper divisors (799618355).

2102131405 is a wasteful number, since it uses less digits than its factorization.

2102131405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2102131405 is about 45849.0065868389. The cubic root of 2102131405 is about 1281.0122618031.

Adding to 2102131405 its reverse (5041312012), we get a palindrome (7143443417).

The spelling of 2102131405 in words is "two billion, one hundred two million, one hundred thirty-one thousand, four hundred five".