213434034021 has 16 divisors (see below), whose sum is σ = 340521536320. Its totient is φ = 131344020720.

The previous prime is 213434033977. The next prime is 213434034089. The reversal of 213434034021 is 120430434312.

213434034021 is a `hidden beast` number, since 213 + 4 + 3 + 40 + 3 + 402 + 1 = 666.

It is not a de Polignac number, because 213434034021 - 2⁹ = 213434033509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213434034721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304036735 + ... + 304037436.

It is an arithmetic number, because the mean of its divisors is an integer number (21282596020).

Almost surely, 2^213434034021 is an apocalyptic number.

It is an amenable number.

213434034021 is a deficient number, since it is larger than the sum of its proper divisors (127087502299).

213434034021 is a wasteful number, since it uses less digits than its factorization.

213434034021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608074193 (or 608074187 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 213434034021 its reverse (120430434312), we get a palindrome (333864468333).

The spelling of 213434034021 in words is "two hundred thirteen billion, four hundred thirty-four million, thirty-four thousand, twenty-one".