3251421820021 has 2 divisors, whose sum is σ = 3251421820022. Its totient is φ = 3251421820020.

The previous prime is 3251421820019. The next prime is 3251421820039. The reversal of 3251421820021 is 1200281241523.

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., 2941825280625 + 309596539396 = 1715175^2 + 556414^2 .

It is a cyclic number.

It is not a de Polignac number, because 3251421820021 - 2¹ = 3251421820019 is a prime.

Together with 3251421820019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3251421820051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1625710910010 + 1625710910011.

It is an arithmetic number, because the mean of its divisors is an integer number (1625710910011).

Almost surely, 2^{3251421820021} is an apocalyptic number.

It is an amenable number.

3251421820021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3251421820021 is an equidigital number, since it uses as much as digits as its factorization.

3251421820021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The spelling of 3251421820021 in words is "three trillion, two hundred fifty-one billion, four hundred twenty-one million, eight hundred twenty thousand, twenty-one".