2121011020 has 24 divisors (see below), whose sum is σ = 4497371424. Its totient is φ = 840166656.

The previous prime is 2121010973. The next prime is 2121011071. The reversal of 2121011020 is 201101212.

It is a super-2 number, since 2×2121011020² = 8997375493922880800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2121010988 and 2121011006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512749 + ... + 516868.

It is an arithmetic number, because the mean of its divisors is an integer number (187390476).

Almost surely, 2^2121011020 is an apocalyptic number.

2121011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121011020 is an abundant number, since it is smaller than the sum of its proper divisors (2376360404).

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

2121011020 is a wasteful number, since it uses less digits than its factorization.

2121011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029729 (or 1029727 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2121011020 is about 46054.4353998613. The cubic root of 2121011020 is about 1284.8358372551.

Adding to 2121011020 its reverse (201101212), we get a palindrome (2322112232).

The spelling of 2121011020 in words is "two billion, one hundred twenty-one million, eleven thousand, twenty".