20121111221020 has 24 divisors (see below), whose sum is σ = 42390199601568. Its totient is φ = 8022565243200.

The previous prime is 20121111221009. The next prime is 20121111221039. The reversal of 20121111221020 is 2012211112102.

It is a junction number, because it is equal to n+sod(n) for n = 20121111220985 and 20121111221003.

It is a congruent number.

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, 1617446451 + ... + 1617458890.

It is an arithmetic number, because the mean of its divisors is an integer number (1766258316732).

Almost surely, 2^{20121111221020} is an apocalyptic number.

20121111221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121111221020 is an abundant number, since it is smaller than the sum of its proper divisors (22269088380548).

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

20121111221020 is a wasteful number, since it uses less digits than its factorization.

20121111221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234905661 (or 3234905659 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121111221020 its reverse (2012211112102), we get a palindrome (22133322333122).

The spelling of 20121111221020 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, twenty".