202100121020 has 96 divisors (see below), whose sum is σ = 499506739200. Its totient is φ = 67254580224.

The previous prime is 202100120977. The next prime is 202100121031. The reversal of 202100121020 is 20121001202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 202100120992 and 202100121010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497684 + ... + 807396.

It is an arithmetic number, because the mean of its divisors is an integer number (5203195200).

Almost surely, 2^202100121020 is an apocalyptic number.

202100121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202100121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249753369600).

202100121020 is an abundant number, since it is smaller than the sum of its proper divisors (297406618180).

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

202100121020 is a wasteful number, since it uses less digits than its factorization.

202100121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309867 (or 309865 counting only the distinct ones).

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

Adding to 202100121020 its reverse (20121001202), we get a palindrome (222221122222).

The spelling of 202100121020 in words is "two hundred two billion, one hundred million, one hundred twenty-one thousand, twenty".