221202221131 has 4 divisors (see below), whose sum is σ = 221221482664. Its totient is φ = 221182959600.

The previous prime is 221202221129. The next prime is 221202221147. The reversal of 221202221131 is 131122202122.

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 221202221131 - 2¹ = 221202221129 is a prime.

It is a super-2 number, since 2×221202221131² (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 = 221202221099 and 221202221108.

It is not an unprimeable number, because it can be changed into a prime (221202221531) 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, 9613530 + ... + 9636511.

It is an arithmetic number, because the mean of its divisors is an integer number (55305370666).

Almost surely, 2^221202221131 is an apocalyptic number.

221202221131 is a deficient number, since it is larger than the sum of its proper divisors (19261533).

221202221131 is a wasteful number, since it uses less digits than its factorization.

221202221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19261532.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221202221131 its reverse (131122202122), we get a palindrome (352324423253).

The spelling of 221202221131 in words is "two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred thirty-one".