213221020131 has 24 divisors (see below), whose sum is σ = 352090302720. Its totient is φ = 121803753456.

The previous prime is 213221020121. The next prime is 213221020169. The reversal of 213221020131 is 131020122312.

213221020131 is a `hidden beast` number, since 213 + 221 + 0 + 201 + 31 = 666.

It is not a de Polignac number, because 213221020131 - 2⁹ = 213221019619 is a prime.

It is a super-2 number, since 2×213221020131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213221020121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300765 + ... + 718958.

It is an arithmetic number, because the mean of its divisors is an integer number (14670429280).

Almost surely, 2^213221020131 is an apocalyptic number.

213221020131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213221020131 is a deficient number, since it is larger than the sum of its proper divisors (138869282589).

213221020131 is a wasteful number, since it uses less digits than its factorization.

213221020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023055 (or 1023052 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 213221020131 its reverse (131020122312), we get a palindrome (344241142443).

The spelling of 213221020131 in words is "two hundred thirteen billion, two hundred twenty-one million, twenty thousand, one hundred thirty-one".