212121222028 has 12 divisors (see below), whose sum is σ = 374497202520. Its totient is φ = 105122021312.

The previous prime is 212121221999. The next prime is 212121222029. The reversal of 212121222028 is 820222121212.

It is a junction number, because it is equal to n+sod(n) for n = 212121221993 and 212121222011.

It is not an unprimeable number, because it can be changed into a prime (212121222029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234646918 + ... + 234647821.

It is an arithmetic number, because the mean of its divisors is an integer number (31208100210).

Almost surely, 2^212121222028 is an apocalyptic number.

It is an amenable number.

212121222028 is a deficient number, since it is larger than the sum of its proper divisors (162375980492).

212121222028 is a wasteful number, since it uses less digits than its factorization.

212121222028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469294856 (or 469294854 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The spelling of 212121222028 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-eight".