1028450396221 has 16 divisors (see below), whose sum is σ = 1065781093680. Its totient is φ = 991806865920.

The previous prime is 1028450396177. The next prime is 1028450396249. The reversal of 1028450396221 is 1226930548201.

It can be written as a sum of positive squares in 8 ways, for example, as 98548905625 + 929901490596 = 313925^2 + 964314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028450396221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028450390221) 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, 4521895 + ... + 4743883.

It is an arithmetic number, because the mean of its divisors is an integer number (66611318355).

Almost surely, 2^{1028450396221} is an apocalyptic number.

It is an amenable number.

1028450396221 is a deficient number, since it is larger than the sum of its proper divisors (37330697459).

1028450396221 is a wasteful number, since it uses less digits than its factorization.

1028450396221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223536.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 1028450396221 in words is "one trillion, twenty-eight billion, four hundred fifty million, three hundred ninety-six thousand, two hundred twenty-one".