2028121020 has 36 divisors (see below), whose sum is σ = 6151967640. Its totient is φ = 540832224.

The previous prime is 2028120959. The next prime is 2028121057. The reversal of 2028121020 is 201218202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×2028121020² = 8226549743531680800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2028120984 and 2028121002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5633490 + ... + 5633849.

It is an arithmetic number, because the mean of its divisors is an integer number (170887990).

Almost surely, 2^2028121020 is an apocalyptic number.

2028121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2028121020 is an abundant number, since it is smaller than the sum of its proper divisors (4123846620).

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

2028121020 is a wasteful number, since it uses less digits than its factorization.

2028121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267354 (or 11267349 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2028121020 is about 45034.6646484683. The cubic root of 2028121020 is about 1265.7986322732.

Adding to 2028121020 its reverse (201218202), we get a palindrome (2229339222).

The spelling of 2028121020 in words is "two billion, twenty-eight million, one hundred twenty-one thousand, twenty".