400212433045421 has 2 divisors, whose sum is σ = 400212433045422. Its totient is φ = 400212433045420.

The previous prime is 400212433045379. The next prime is 400212433045457. The reversal of 400212433045421 is 124540334212004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312886959109321 + 87325473936100 = 17688611^2 + 9344810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400212433045421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400212433045121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200106216522710 + 200106216522711.

It is an arithmetic number, because the mean of its divisors is an integer number (200106216522711).

Almost surely, 2^{400212433045421} is an apocalyptic number.

It is an amenable number.

400212433045421 is a deficient number, since it is larger than the sum of its proper divisors (1).

400212433045421 is an equidigital number, since it uses as much as digits as its factorization.

400212433045421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 400212433045421 its reverse (124540334212004), we get a palindrome (524752767257425).

The spelling of 400212433045421 in words is "four hundred trillion, two hundred twelve billion, four hundred thirty-three million, forty-five thousand, four hundred twenty-one".