400213133232421 has 2 divisors, whose sum is σ = 400213133232422. Its totient is φ = 400213133232420.

The previous prime is 400213133232379. The next prime is 400213133232431. The reversal of 400213133232421 is 124232331312004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274760924935396 + 125452208297025 = 16575914^2 + 11200545^2 .

It is a cyclic number.

It is not a de Polignac number, because 400213133232421 - 2¹⁵ = 400213133199653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400213133232431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200106566616210 + 200106566616211.

It is an arithmetic number, because the mean of its divisors is an integer number (200106566616211).

Almost surely, 2^{400213133232421} is an apocalyptic number.

It is an amenable number.

400213133232421 is a deficient number, since it is larger than the sum of its proper divisors (1).

400213133232421 is an equidigital number, since it uses as much as digits as its factorization.

400213133232421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 400213133232421 its reverse (124232331312004), we get a palindrome (524445464544425).

The spelling of 400213133232421 in words is "four hundred trillion, two hundred thirteen billion, one hundred thirty-three million, two hundred thirty-two thousand, four hundred twenty-one".