2134420021 has 4 divisors (see below), whose sum is σ = 2134518444. Its totient is φ = 2134321600.

The previous prime is 2134419953. The next prime is 2134420037. The reversal of 2134420021 is 1200244312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1188180900 + 946239121 = 34470^2 + 30761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2134420021 - 2¹⁹ = 2133895733 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 (2134420051) 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, 820 + ... + 65341.

It is an arithmetic number, because the mean of its divisors is an integer number (533629611).

Almost surely, 2^2134420021 is an apocalyptic number.

It is an amenable number.

2134420021 is a deficient number, since it is larger than the sum of its proper divisors (98423).

2134420021 is an equidigital number, since it uses as much as digits as its factorization.

2134420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98422.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2134420021 is about 46199.7837765503. The cubic root of 2134420021 is about 1287.5377226639.

Adding to 2134420021 its reverse (1200244312), we get a palindrome (3334664333).

The spelling of 2134420021 in words is "two billion, one hundred thirty-four million, four hundred twenty thousand, twenty-one".