213433334021 has 4 divisors (see below), whose sum is σ = 214539206412. Its totient is φ = 212327461632.

The previous prime is 213433333987. The next prime is 213433334033. The reversal of 213433334021 is 120433334312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158073832225 + 55359501796 = 397585^2 + 235286^2 .

It is a cyclic number.

It is not a de Polignac number, because 213433334021 - 2²² = 213429139717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213433336021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552935906 + ... + 552936291.

It is an arithmetic number, because the mean of its divisors is an integer number (53634801603).

Almost surely, 2^213433334021 is an apocalyptic number.

It is an amenable number.

213433334021 is a deficient number, since it is larger than the sum of its proper divisors (1105872391).

213433334021 is a wasteful number, since it uses less digits than its factorization.

213433334021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105872390.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 213433334021 its reverse (120433334312), we get a palindrome (333866668333).

The spelling of 213433334021 in words is "two hundred thirteen billion, four hundred thirty-three million, three hundred thirty-four thousand, twenty-one".