1001121210020 has 24 divisors (see below), whose sum is σ = 2128966627200. Its totient is φ = 395379515232.

The previous prime is 1001121210017. The next prime is 1001121210041. The reversal of 1001121210020 is 200121211001.

It is a junction number, because it is equal to n+sod(n) for n = 1001121209983 and 1001121210010.

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, 316808930 + ... + 316812089.

It is an arithmetic number, because the mean of its divisors is an integer number (88706942800).

Almost surely, 2^{1001121210020} is an apocalyptic number.

1001121210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001121210020 is an abundant number, since it is smaller than the sum of its proper divisors (1127845417180).

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

1001121210020 is a wasteful number, since it uses less digits than its factorization.

1001121210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633621107 (or 633621105 counting only the distinct ones).

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

Adding to 1001121210020 its reverse (200121211001), we get a palindrome (1201242421021).

The spelling of 1001121210020 in words is "one trillion, one billion, one hundred twenty-one million, two hundred ten thousand, twenty".