213111022213 has 4 divisors (see below), whose sum is σ = 213617224588. Its totient is φ = 212604819840.

The previous prime is 213111022207. The next prime is 213111022217. The reversal of 213111022213 is 312220111312.

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 2922699844 + 210188322369 = 54062^2 + 458463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213111022213 is a prime.

It is a super-3 number, since 3×213111022213³ (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 (213111022217) 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, 253100556 + ... + 253101397.

It is an arithmetic number, because the mean of its divisors is an integer number (53404306147).

Almost surely, 2^213111022213 is an apocalyptic number.

It is an amenable number.

213111022213 is a deficient number, since it is larger than the sum of its proper divisors (506202375).

213111022213 is an equidigital number, since it uses as much as digits as its factorization.

213111022213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506202374.

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

Adding to 213111022213 its reverse (312220111312), we get a palindrome (525331133525).

The spelling of 213111022213 in words is "two hundred thirteen billion, one hundred eleven million, twenty-two thousand, two hundred thirteen".