1211020011020 has 24 divisors (see below), whose sum is σ = 2561438014800. Its totient is φ = 480923053632.

The previous prime is 1211020010953. The next prime is 1211020011031. The reversal of 1211020011020 is 201100201121.

It is a junction number, because it is equal to n+sod(n) for n = 1211020010992 and 1211020011010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217806575 + ... + 217812134.

It is an arithmetic number, because the mean of its divisors is an integer number (106726583950).

Almost surely, 2^{1211020011020} is an apocalyptic number.

1211020011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211020011020 is an abundant number, since it is smaller than the sum of its proper divisors (1350418003780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211020011020 is a wasteful number, since it uses less digits than its factorization.

1211020011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435618857 (or 435618855 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211020011020 its reverse (201100201121), we get a palindrome (1412120212141).

The spelling of 1211020011020 in words is "one trillion, two hundred eleven billion, twenty million, eleven thousand, twenty".