2121321401 has 2 divisors, whose sum is σ = 2121321402. Its totient is φ = 2121321400.

The previous prime is 2121321373. The next prime is 2121321403. The reversal of 2121321401 is 1041231212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1734805801 + 386515600 = 41651^2 + 19660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121321401 - 2¹⁸ = 2121059257 is a prime.

Together with 2121321403, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121321401.

It is not a weakly prime, because it can be changed into another prime (2121321403) 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 as a sum of consecutive naturals, namely, 1060660700 + 1060660701.

It is an arithmetic number, because the mean of its divisors is an integer number (1060660701).

Almost surely, 2^2121321401 is an apocalyptic number.

It is an amenable number.

2121321401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121321401 is an equidigital number, since it uses as much as digits as its factorization.

2121321401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2121321401 is about 46057.8049954620. The cubic root of 2121321401 is about 1284.8985069249.

Adding to 2121321401 its reverse (1041231212), we get a palindrome (3162552613).

The spelling of 2121321401 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, four hundred one".