2121000220 has 12 divisors (see below), whose sum is σ = 4454100504. Its totient is φ = 848400080.

The previous prime is 2121000197. The next prime is 2121000227. The reversal of 2121000220 is 220001212.

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 = 2121000197 and 2121000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121000227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53024986 + ... + 53025025.

It is an arithmetic number, because the mean of its divisors is an integer number (371175042).

Almost surely, 2^2121000220 is an apocalyptic number.

2121000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121000220 is an abundant number, since it is smaller than the sum of its proper divisors (2333100284).

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

2121000220 is a wasteful number, since it uses less digits than its factorization.

2121000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106050020 (or 106050018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2121000220 is about 46054.3181471618. The cubic root of 2121000220 is about 1284.8336564946.

Adding to 2121000220 its reverse (220001212), we get a palindrome (2341001432).

The spelling of 2121000220 in words is "two billion, one hundred twenty-one million, two hundred twenty", and thus it is an aban number.