2102131421 has 16 divisors (see below), whose sum is σ = 2380976640. Its totient is φ = 1842384960.

The previous prime is 2102131403. The next prime is 2102131441. The reversal of 2102131421 is 1241312012.

It is not a de Polignac number, because 2102131421 - 2¹⁰ = 2102130397 is a prime.

It is a super-2 number, since 2×2102131421² = 8837913022310958482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102131421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102131441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27851 + ... + 70568.

It is an arithmetic number, because the mean of its divisors is an integer number (148811040).

Almost surely, 2^2102131421 is an apocalyptic number.

It is an amenable number.

2102131421 is a deficient number, since it is larger than the sum of its proper divisors (278845219).

2102131421 is a wasteful number, since it uses less digits than its factorization.

2102131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98516.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2102131421 is about 45849.0067613247. The cubic root of 2102131421 is about 1281.0122650532.

Adding to 2102131421 its reverse (1241312012), we get a palindrome (3343443433).

The spelling of 2102131421 in words is "two billion, one hundred two million, one hundred thirty-one thousand, four hundred twenty-one".