213400034021 has 2 divisors, whose sum is σ = 213400034022. Its totient is φ = 213400034020.

The previous prime is 213400034017. The next prime is 213400034131. The reversal of 213400034021 is 120430004312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191046793921 + 22353240100 = 437089^2 + 149510^2 .

It is a cyclic number.

It is not a de Polignac number, because 213400034021 - 2² = 213400034017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213400033984 and 213400034002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213400034521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106700017010 + 106700017011.

It is an arithmetic number, because the mean of its divisors is an integer number (106700017011).

Almost surely, 2^213400034021 is an apocalyptic number.

It is an amenable number.

213400034021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213400034021 is an equidigital number, since it uses as much as digits as its factorization.

213400034021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 213400034021 its reverse (120430004312), we get a palindrome (333830038333).

The spelling of 213400034021 in words is "two hundred thirteen billion, four hundred million, thirty-four thousand, twenty-one".