200120121020 has 24 divisors (see below), whose sum is σ = 428181544224. Its totient is φ = 78537707456.

The previous prime is 200120121013. The next prime is 200120121023. The reversal of 200120121020 is 20121021002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 200120120992 and 200120121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200120121023) 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, 94395224 + ... + 94397343.

It is an arithmetic number, because the mean of its divisors is an integer number (17840897676).

Almost surely, 2^200120121020 is an apocalyptic number.

200120121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200120121020 is an abundant number, since it is smaller than the sum of its proper divisors (228061423204).

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

200120121020 is a wasteful number, since it uses less digits than its factorization.

200120121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188792629 (or 188792627 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 200120121020 its reverse (20121021002), we get a palindrome (220241142022).

The spelling of 200120121020 in words is "two hundred billion, one hundred twenty million, one hundred twenty-one thousand, twenty".