213834859621 has 8 divisors (see below), whose sum is σ = 226603805400. Its totient is φ = 201425602560.

The previous prime is 213834859559. The next prime is 213834859631. The reversal of 213834859621 is 126958438312.

It can be written as a sum of positive squares in 4 ways, for example, as 40687327521 + 173147532100 = 201711^2 + 416110^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213834859621 - 2¹¹ = 213834857573 is a prime.

It is a super-3 number, since 3×213834859621³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213834859631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89920956 + ... + 89923333.

It is an arithmetic number, because the mean of its divisors is an integer number (28325475675).

Almost surely, 2^213834859621 is an apocalyptic number.

It is an amenable number.

213834859621 is a deficient number, since it is larger than the sum of its proper divisors (12768945779).

213834859621 is a wasteful number, since it uses less digits than its factorization.

213834859621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179844359.

The product of its digits is 2488320, while the sum is 52.

The spelling of 213834859621 in words is "two hundred thirteen billion, eight hundred thirty-four million, eight hundred fifty-nine thousand, six hundred twenty-one".