2221121111031 has 16 divisors (see below), whose sum is σ = 3404017029600. Its totient is φ = 1429687151424.

The previous prime is 2221121111009. The next prime is 2221121111057. The reversal of 2221121111031 is 1301111211222.

It is a happy number.

It is not a de Polignac number, because 2221121111031 - 2⁹ = 2221121110519 is a prime.

It is a super-2 number, since 2×2221121111031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2221121110995 and 2221121111013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221121111081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1418339646 + ... + 1418341211.

It is an arithmetic number, because the mean of its divisors is an integer number (212751064350).

Almost surely, 2^{2221121111031} is an apocalyptic number.

2221121111031 is a deficient number, since it is larger than the sum of its proper divisors (1182895918569).

2221121111031 is a wasteful number, since it uses less digits than its factorization.

2221121111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836680895 (or 2836680889 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 2221121111031 its reverse (1301111211222), we get a palindrome (3522232322253).

The spelling of 2221121111031 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, thirty-one".