211431400402021 has 2 divisors, whose sum is σ = 211431400402022. Its totient is φ = 211431400402020.

The previous prime is 211431400402007. The next prime is 211431400402039. The reversal of 211431400402021 is 120204004134112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171544218105121 + 39887182296900 = 13097489^2 + 6315630^2 .

It is a cyclic number.

It is not a de Polignac number, because 211431400402021 - 2³⁹ = 210881644588133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211431400402121) 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, 105715700201010 + 105715700201011.

It is an arithmetic number, because the mean of its divisors is an integer number (105715700201011).

Almost surely, 2^{211431400402021} is an apocalyptic number.

It is an amenable number.

211431400402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211431400402021 is an equidigital number, since it uses as much as digits as its factorization.

211431400402021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 211431400402021 its reverse (120204004134112), we get a palindrome (331635404536133).

The spelling of 211431400402021 in words is "two hundred eleven trillion, four hundred thirty-one billion, four hundred million, four hundred two thousand, twenty-one".