212021123128 has 32 divisors (see below), whose sum is σ = 399416463360. Its totient is φ = 105510872160.

The previous prime is 212021123087. The next prime is 212021123183. The reversal of 212021123128 is 821321120212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2081401 + ... + 2180887.

It is an arithmetic number, because the mean of its divisors is an integer number (12481764480).

Almost surely, 2^212021123128 is an apocalyptic number.

It is an amenable number.

212021123128 is a deficient number, since it is larger than the sum of its proper divisors (187395340232).

212021123128 is a wasteful number, since it uses less digits than its factorization.

212021123128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100747 (or 100743 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The spelling of 212021123128 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-three thousand, one hundred twenty-eight".