213531020205 has 16 divisors (see below), whose sum is σ = 341676412224. Its totient is φ = 113874284160.

The previous prime is 213531020191. The next prime is 213531020221. The reversal of 213531020205 is 502020135312.

It is a happy number.

It is not a de Polignac number, because 213531020205 - 2⁵ = 213531020173 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357856 + ... + 745065.

It is an arithmetic number, because the mean of its divisors is an integer number (21354775764).

Almost surely, 2^213531020205 is an apocalyptic number.

It is an amenable number.

213531020205 is a deficient number, since it is larger than the sum of its proper divisors (128145392019).

213531020205 is a wasteful number, since it uses less digits than its factorization.

213531020205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115836.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 213531020205 its reverse (502020135312), we get a palindrome (715551155517).

The spelling of 213531020205 in words is "two hundred thirteen billion, five hundred thirty-one million, twenty thousand, two hundred five".