2106061421 has 4 divisors (see below), whose sum is σ = 2106156000. Its totient is φ = 2105966844.

The previous prime is 2106061387. The next prime is 2106061453. The reversal of 2106061421 is 1241606012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2106061421 - 2²⁶ = 2038952557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106061481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6530 + ... + 65228.

It is an arithmetic number, because the mean of its divisors is an integer number (526539000).

Almost surely, 2^2106061421 is an apocalyptic number.

It is an amenable number.

2106061421 is a deficient number, since it is larger than the sum of its proper divisors (94579).

2106061421 is an equidigital number, since it uses as much as digits as its factorization.

2106061421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94578.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2106061421 is about 45891.8448201856. The cubic root of 2106061421 is about 1281.8100654979.

Adding to 2106061421 its reverse (1241606012), we get a palindrome (3347667433).

The spelling of 2106061421 in words is "two billion, one hundred six million, sixty-one thousand, four hundred twenty-one".