1221827030928 has 120 divisors (see below), whose sum is σ = 3910915060416. Its totient is φ = 348824736000.

The previous prime is 1221827030923. The next prime is 1221827030939. The reversal of 1221827030928 is 8290307281221.

It is a super-2 number, since 2×1221827030928² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221827030923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 845563 + ... + 1777253.

Almost surely, 2^{1221827030928} is an apocalyptic number.

1221827030928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221827030928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1955457530208).

1221827030928 is an abundant number, since it is smaller than the sum of its proper divisors (2689088029488).

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

1221827030928 is a wasteful number, since it uses less digits than its factorization.

1221827030928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933013 (or 933004 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 1221827030928 in words is "one trillion, two hundred twenty-one billion, eight hundred twenty-seven million, thirty thousand, nine hundred twenty-eight".