212021121228 has 24 divisors (see below), whose sum is σ = 565389656832. Its totient is φ = 60577463184.

The previous prime is 212021121227. The next prime is 212021121269. The reversal of 212021121228 is 822121120212.

212021121228 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212021121198 and 212021121207.

It is not an unprimeable number, because it can be changed into a prime (212021121227) 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, 1262030400 + ... + 1262030567.

It is an arithmetic number, because the mean of its divisors is an integer number (23557902368).

Almost surely, 2^212021121228 is an apocalyptic number.

212021121228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

212021121228 is an abundant number, since it is smaller than the sum of its proper divisors (353368535604).

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

212021121228 is a wasteful number, since it uses less digits than its factorization.

212021121228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524060981 (or 2524060979 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 212021121228 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-eight".