2120403421 has 4 divisors (see below), whose sum is σ = 2245133052. Its totient is φ = 1995673792.

The previous prime is 2120403403. The next prime is 2120403433. The reversal of 2120403421 is 1243040212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1581652900 + 538750521 = 39770^2 + 23211^2 .

It is not a de Polignac number, because 2120403421 - 2¹⁹ = 2119879133 is a prime.

It is a super-2 number, since 2×2120403421² = 8992221335577006482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120403451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62364790 + ... + 62364823.

It is an arithmetic number, because the mean of its divisors is an integer number (561283263).

Almost surely, 2^2120403421 is an apocalyptic number.

It is an amenable number.

2120403421 is a deficient number, since it is larger than the sum of its proper divisors (124729631).

2120403421 is a wasteful number, since it uses less digits than its factorization.

2120403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124729630.

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

The square root of 2120403421 is about 46047.8383966066. The cubic root of 2120403421 is about 1284.7131379827.

Adding to 2120403421 its reverse (1243040212), we get a palindrome (3363443633).

The spelling of 2120403421 in words is "two billion, one hundred twenty million, four hundred three thousand, four hundred twenty-one".