2120421421 has 4 divisors (see below), whose sum is σ = 2188822144. Its totient is φ = 2052020700.

The previous prime is 2120421397. The next prime is 2120421431. The reversal of 2120421421 is 1241240212.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120421421 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 (2120421431) 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, 34200315 + ... + 34200376.

It is an arithmetic number, because the mean of its divisors is an integer number (547205536).

Almost surely, 2^2120421421 is an apocalyptic number.

It is an amenable number.

2120421421 is a deficient number, since it is larger than the sum of its proper divisors (68400723).

2120421421 is an equidigital number, since it uses as much as digits as its factorization.

2120421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68400722.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2120421421 is about 46048.0338451057. The cubic root of 2120421421 is about 1284.7167732612.

Adding to 2120421421 its reverse (1241240212), we get a palindrome (3361661633).

The spelling of 2120421421 in words is "two billion, one hundred twenty million, four hundred twenty-one thousand, four hundred twenty-one".