200121121020 has 48 divisors (see below), whose sum is σ = 589830675840. Its totient is φ = 50556914496.

The previous prime is 200121120989. The next prime is 200121121049. The reversal of 200121121020 is 20121121002.

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 = 200121120987 and 200121121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87771282 + ... + 87773561.

It is an arithmetic number, because the mean of its divisors is an integer number (12288139080).

Almost surely, 2^200121121020 is an apocalyptic number.

200121121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200121121020 is an abundant number, since it is smaller than the sum of its proper divisors (389709554820).

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

200121121020 is a wasteful number, since it uses less digits than its factorization.

200121121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175544874 (or 175544872 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 200121121020 its reverse (20121121002), we get a palindrome (220242242022).

The spelling of 200121121020 in words is "two hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty".