20212121122212 has 12 divisors (see below), whose sum is σ = 47161615951856. Its totient is φ = 6737373707400.

The previous prime is 20212121122183. The next prime is 20212121122213. The reversal of 20212121122212 is 21222112121202.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20212121122213) 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, 842171713414 + ... + 842171713437.

Almost surely, 2^{20212121122212} is an apocalyptic number.

It is an amenable number.

20212121122212 is an abundant number, since it is smaller than the sum of its proper divisors (26949494829644).

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

20212121122212 is a wasteful number, since it uses less digits than its factorization.

20212121122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684343426858 (or 1684343426856 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 20212121122212 its reverse (21222112121202), we get a palindrome (41434233243414).

The spelling of 20212121122212 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twelve".