221121301031 has 4 divisors (see below), whose sum is σ = 221122258512. Its totient is φ = 221120343552.

The previous prime is 221121301013. The next prime is 221121301057. The reversal of 221121301031 is 130103121122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121301031 is a prime.

It is a super-2 number, since 2×221121301031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121301061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104615 + ... + 673191.

It is an arithmetic number, because the mean of its divisors is an integer number (55280564628).

Almost surely, 2^221121301031 is an apocalyptic number.

221121301031 is a deficient number, since it is larger than the sum of its proper divisors (957481).

221121301031 is an equidigital number, since it uses as much as digits as its factorization.

221121301031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957480.

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

Adding to 221121301031 its reverse (130103121122), we get a palindrome (351224422153).

The spelling of 221121301031 in words is "two hundred twenty-one billion, one hundred twenty-one million, three hundred one thousand, thirty-one".