212021101218 has 32 divisors (see below), whose sum is σ = 427069146240. Its totient is φ = 70169898240.

The previous prime is 212021101183. The next prime is 212021101219. The reversal of 212021101218 is 812101120212.

It is a junction number, because it is equal to n+sod(n) for n = 212021101194 and 212021101203.

It is not an unprimeable number, because it can be changed into a prime (212021101219) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1157178 + ... + 1327818.

It is an arithmetic number, because the mean of its divisors is an integer number (13345910820).

Almost surely, 2^212021101218 is an apocalyptic number.

212021101218 is an abundant number, since it is smaller than the sum of its proper divisors (215048045022).

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

212021101218 is a wasteful number, since it uses less digits than its factorization.

212021101218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172122.

The product of its (nonzero) digits is 128, while the sum is 21.

The spelling of 212021101218 in words is "two hundred twelve billion, twenty-one million, one hundred one thousand, two hundred eighteen".