213221213101 has 4 divisors (see below), whose sum is σ = 229622844892. Its totient is φ = 196819581312.

The previous prime is 213221213099. The next prime is 213221213123. The reversal of 213221213101 is 101312122312.

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 82441339876 + 130779873225 = 287126^2 + 361635^2 .

It is a cyclic number.

It is not a de Polignac number, because 213221213101 - 2¹ = 213221213099 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 (213221213501) 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, 8200815876 + ... + 8200815901.

It is an arithmetic number, because the mean of its divisors is an integer number (57405711223).

Almost surely, 2^213221213101 is an apocalyptic number.

It is an amenable number.

213221213101 is a deficient number, since it is larger than the sum of its proper divisors (16401631791).

213221213101 is a wasteful number, since it uses less digits than its factorization.

213221213101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16401631790.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 213221213101 its reverse (101312122312), we get a palindrome (314533335413).

The spelling of 213221213101 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred one".