2102110421 has 2 divisors, whose sum is σ = 2102110422. Its totient is φ = 2102110420.

The previous prime is 2102110397. The next prime is 2102110457. The reversal of 2102110421 is 1240112012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1184323396 + 917787025 = 34414^2 + 30295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102110421 - 2⁶ = 2102110357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102110396 and 2102110405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102110471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051055210 + 1051055211.

It is an arithmetic number, because the mean of its divisors is an integer number (1051055211).

Almost surely, 2^2102110421 is an apocalyptic number.

It is an amenable number.

2102110421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102110421 is an equidigital number, since it uses as much as digits as its factorization.

2102110421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2102110421 is about 45848.7777481581. Note that the first 4 decimals coincide. The cubic root of 2102110421 is about 1281.0079993276.

Adding to 2102110421 its reverse (1240112012), we get a palindrome (3342222433).

The spelling of 2102110421 in words is "two billion, one hundred two million, one hundred ten thousand, four hundred twenty-one".