213122201131 has 4 divisors (see below), whose sum is σ = 243568229872. Its totient is φ = 182676172392.

The previous prime is 213122201087. The next prime is 213122201161. The reversal of 213122201131 is 131102221312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213122201131 - 2¹⁷ = 213122070059 is a prime.

It is a super-2 number, since 2×213122201131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213122201099 and 213122201108.

It is not an unprimeable number, because it can be changed into a prime (213122201161) 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, 15223014360 + ... + 15223014373.

It is an arithmetic number, because the mean of its divisors is an integer number (60892057468).

Almost surely, 2^213122201131 is an apocalyptic number.

213122201131 is a deficient number, since it is larger than the sum of its proper divisors (30446028741).

213122201131 is an equidigital number, since it uses as much as digits as its factorization.

213122201131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30446028740.

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

Adding to 213122201131 its reverse (131102221312), we get a palindrome (344224422443).

The spelling of 213122201131 in words is "two hundred thirteen billion, one hundred twenty-two million, two hundred one thousand, one hundred thirty-one".