1031221028 has 12 divisors (see below), whose sum is σ = 1806453852. Its totient is φ = 515091360.

The previous prime is 1031221027. The next prime is 1031221091. The reversal of 1031221028 is 8201221301.

It can be written as a sum of positive squares in 2 ways, for example, as 563017984 + 468203044 = 23728^2 + 21638^2 .

It is not an unprimeable number, because it can be changed into a prime (1031221021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125303 + ... + 133278.

It is an arithmetic number, because the mean of its divisors is an integer number (150537821).

Almost surely, 2^1031221028 is an apocalyptic number.

It is an amenable number.

1031221028 is a deficient number, since it is larger than the sum of its proper divisors (775232824).

1031221028 is a wasteful number, since it uses less digits than its factorization.

1031221028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259582 (or 259580 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1031221028 is about 32112.6303500663. The cubic root of 1031221028 is about 1010.3005438301.

Adding to 1031221028 its reverse (8201221301), we get a palindrome (9232442329).

The spelling of 1031221028 in words is "one billion, thirty-one million, two hundred twenty-one thousand, twenty-eight".