1222021100028 has 24 divisors (see below), whose sum is σ = 2872195582032. Its totient is φ = 404367078784.

The previous prime is 1222021100021. The next prime is 1222021100033. The reversal of 1222021100028 is 8200011202221.

It is a junction number, because it is equal to n+sod(n) for n = 1222021099977 and 1222021100013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222021100021) 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, 371659275 + ... + 371662562.

It is an arithmetic number, because the mean of its divisors is an integer number (119674815918).

Almost surely, 2^{1222021100028} is an apocalyptic number.

It is an amenable number.

1222021100028 is an abundant number, since it is smaller than the sum of its proper divisors (1650174482004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222021100028 is a wasteful number, since it uses less digits than its factorization.

1222021100028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743321981 (or 743321979 counting only the distinct ones).

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

Adding to 1222021100028 its reverse (8200011202221), we get a palindrome (9422032302249).

The spelling of 1222021100028 in words is "one trillion, two hundred twenty-two billion, twenty-one million, one hundred thousand, twenty-eight".