1021110121028 has 6 divisors (see below), whose sum is σ = 1786942711806. Its totient is φ = 510555060512.

The previous prime is 1021110121027. The next prime is 1021110121033. The reversal of 1021110121028 is 8201210111201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 618034967104 + 403075153924 = 786152^2 + 634882^2 .

It is not an unprimeable number, because it can be changed into a prime (1021110121027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127638765125 + ... + 127638765132.

It is an arithmetic number, because the mean of its divisors is an integer number (297823785301).

Almost surely, 2^{1021110121028} is an apocalyptic number.

It is an amenable number.

1021110121028 is a deficient number, since it is larger than the sum of its proper divisors (765832590778).

1021110121028 is a wasteful number, since it uses less digits than its factorization.

1021110121028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255277530261 (or 255277530259 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 1021110121028 its reverse (8201210111201), we get a palindrome (9222320232229).

The spelling of 1021110121028 in words is "one trillion, twenty-one billion, one hundred ten million, one hundred twenty-one thousand, twenty-eight".