2102130421 has 2 divisors, whose sum is σ = 2102130422. Its totient is φ = 2102130420.

The previous prime is 2102130419. The next prime is 2102130451. The reversal of 2102130421 is 1240312012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1641384196 + 460746225 = 40514^2 + 21465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102130421 - 2¹ = 2102130419 is a prime.

Together with 2102130419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2102130395 and 2102130404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102130451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051065210 + 1051065211.

It is an arithmetic number, because the mean of its divisors is an integer number (1051065211).

Almost surely, 2^2102130421 is an apocalyptic number.

It is an amenable number.

2102130421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102130421 is an equidigital number, since it uses as much as digits as its factorization.

2102130421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2102130421 is about 45848.9958559618. The cubic root of 2102130421 is about 1281.0120619241.

Adding to 2102130421 its reverse (1240312012), we get a palindrome (3342442433).

The spelling of 2102130421 in words is "two billion, one hundred two million, one hundred thirty thousand, four hundred twenty-one".