1221020000011 has 24 divisors (see below), whose sum is σ = 1488002376960. Its totient is φ = 981278769792.

The previous prime is 1221019999973. The next prime is 1221020000023. The reversal of 1221020000011 is 1100000201221.

It is not a de Polignac number, because 1221020000011 - 2²³ = 1221011611403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221020000111) 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, 615421 + ... + 1679518.

It is an arithmetic number, because the mean of its divisors is an integer number (62000099040).

Almost surely, 2^{1221020000011} is an apocalyptic number.

1221020000011 is a deficient number, since it is larger than the sum of its proper divisors (266982376949).

1221020000011 is a wasteful number, since it uses less digits than its factorization.

1221020000011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295243 (or 2295226 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221020000011 its reverse (1100000201221), we get a palindrome (2321020201232).

The spelling of 1221020000011 in words is "one trillion, two hundred twenty-one billion, twenty million, eleven", and thus it is an aban number.