1122211222221 has 16 divisors (see below), whose sum is σ = 1537364211264. Its totient is φ = 727616433024.

The previous prime is 1122211222207. The next prime is 1122211222277. The reversal of 1122211222221 is 1222221122211.

It is not a de Polignac number, because 1122211222221 - 2⁵ = 1122211222189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122211226221) 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, 1846791 + ... + 2378036.

It is an arithmetic number, because the mean of its divisors is an integer number (96085263204).

Almost surely, 2^{1122211222221} is an apocalyptic number.

It is an amenable number.

1122211222221 is a deficient number, since it is larger than the sum of its proper divisors (415152989043).

1122211222221 is a wasteful number, since it uses less digits than its factorization.

1122211222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4227260.

The product of its digits is 256, while the sum is 21.

Adding to 1122211222221 its reverse (1222221122211), we get a palindrome (2344432344432).

The spelling of 1122211222221 in words is "one trillion, one hundred twenty-two billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".