221121313100031 has 4 divisors (see below), whose sum is σ = 294828417466712. Its totient is φ = 147414208733352.

The previous prime is 221121313099969. The next prime is 221121313100069. The reversal of 221121313100031 is 130001313121122.

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

It is not a de Polignac number, because 221121313100031 - 2²³ = 221121304711423 is a prime.

It is a super-2 number, since 2×221121313100031² (a number of 29 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 = 221121313099980 and 221121313100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121313100071) 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, 36853552183336 + ... + 36853552183341.

It is an arithmetic number, because the mean of its divisors is an integer number (73707104366678).

Almost surely, 2^{221121313100031} is an apocalyptic number.

221121313100031 is a deficient number, since it is larger than the sum of its proper divisors (73707104366681).

221121313100031 is an equidigital number, since it uses as much as digits as its factorization.

221121313100031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73707104366680.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 221121313100031 its reverse (130001313121122), we get a palindrome (351122626221153).

The spelling of 221121313100031 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, three hundred thirteen million, one hundred thousand, thirty-one".