221121213123131 has 8 divisors (see below), whose sum is σ = 229437158329200. Its totient is φ = 212851339636320.

The previous prime is 221121213122981. The next prime is 221121213123197. The reversal of 221121213123131 is 131321312121122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221121213123131 - 2²⁶ = 221121146014267 is a prime.

It is a super-2 number, since 2×221121213123131² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221121213123131.

It is not an unprimeable number, because it can be changed into a prime (221121213120131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11517920036 + ... + 11517939233.

It is an arithmetic number, because the mean of its divisors is an integer number (28679644791150).

Almost surely, 2^{221121213123131} is an apocalyptic number.

221121213123131 is a deficient number, since it is larger than the sum of its proper divisors (8315945206069).

221121213123131 is a wasteful number, since it uses less digits than its factorization.

221121213123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23035859629.

The product of its digits is 864, while the sum is 26.

Adding to 221121213123131 its reverse (131321312121122), we get a palindrome (352442525244253).

The spelling of 221121213123131 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred thirteen million, one hundred twenty-three thousand, one hundred thirty-one".