20121001111020 has 24 divisors (see below), whose sum is σ = 56338803111024. Its totient is φ = 5365600296256.

The previous prime is 20121001110997. The next prime is 20121001111021. The reversal of 20121001111020 is 2011110012102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20121001110987 and 20121001111005.

It is not an unprimeable number, because it can be changed into a prime (20121001111021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167675009199 + ... + 167675009318.

It is an arithmetic number, because the mean of its divisors is an integer number (2347450129626).

Almost surely, 2^{20121001111020} is an apocalyptic number.

20121001111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121001111020 is an abundant number, since it is smaller than the sum of its proper divisors (36217802000004).

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

20121001111020 is a wasteful number, since it uses less digits than its factorization.

20121001111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335350018529 (or 335350018527 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121001111020 its reverse (2011110012102), we get a palindrome (22132111123122).

The spelling of 20121001111020 in words is "twenty trillion, one hundred twenty-one billion, one million, one hundred eleven thousand, twenty".