220021311131 has 4 divisors (see below), whose sum is σ = 220108589064. Its totient is φ = 219934033200.

The previous prime is 220021311091. The next prime is 220021311157. The reversal of 220021311131 is 131113120022.

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

It is a cyclic number.

It is not a de Polignac number, because 220021311131 - 2²⁶ = 219954202267 is a prime.

It is a super-2 number, since 2×220021311131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220021316131) 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, 43635185 + ... + 43640226.

It is an arithmetic number, because the mean of its divisors is an integer number (55027147266).

Almost surely, 2^220021311131 is an apocalyptic number.

220021311131 is a deficient number, since it is larger than the sum of its proper divisors (87277933).

220021311131 is an equidigital number, since it uses as much as digits as its factorization.

220021311131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87277932.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 220021311131 its reverse (131113120022), we get a palindrome (351134431153).

The spelling of 220021311131 in words is "two hundred twenty billion, twenty-one million, three hundred eleven thousand, one hundred thirty-one".