1221010101028 has 12 divisors (see below), whose sum is σ = 2153592620032. Its totient is φ = 605697923880.

The previous prime is 1221010100987. The next prime is 1221010101029. The reversal of 1221010101028 is 8201010101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010100996 and 1221010101014.

It is not an unprimeable number, because it can be changed into a prime (1221010101029) 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, 1201781088 + ... + 1201782103.

Almost surely, 2^{1221010101028} is an apocalyptic number.

It is an amenable number.

1221010101028 is a deficient number, since it is larger than the sum of its proper divisors (932582519004).

1221010101028 is a wasteful number, since it uses less digits than its factorization.

1221010101028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403563322 (or 2403563320 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1221010101028 its reverse (8201010101221), we get a palindrome (9422020202249).

The spelling of 1221010101028 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred one thousand, twenty-eight".