2021401423409 has 2 divisors, whose sum is σ = 2021401423410. Its totient is φ = 2021401423408.

The previous prime is 2021401423397. The next prime is 2021401423441. The reversal of 2021401423409 is 9043241041202.

It is an a-pointer prime, because the next prime (2021401423441) can be obtained adding 2021401423409 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1939850056225 + 81551367184 = 1392785^2 + 285572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021401423409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2020401423409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010700711704 + 1010700711705.

It is an arithmetic number, because the mean of its divisors is an integer number (1010700711705).

Almost surely, 2^{2021401423409} is an apocalyptic number.

It is an amenable number.

2021401423409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021401423409 is an equidigital number, since it uses as much as digits as its factorization.

2021401423409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 2021401423409 in words is "two trillion, twenty-one billion, four hundred one million, four hundred twenty-three thousand, four hundred nine".