2121212220212 has 24 divisors (see below), whose sum is σ = 3833506010880. Its totient is φ = 1025954052480.

The previous prime is 2121212220143. The next prime is 2121212220287. The reversal of 2121212220212 is 2120222121212.

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, 3366773 + ... + 3946844.

It is an arithmetic number, because the mean of its divisors is an integer number (159729417120).

Almost surely, 2^{2121212220212} is an apocalyptic number.

It is an amenable number.

2121212220212 is a deficient number, since it is larger than the sum of its proper divisors (1712293790668).

2121212220212 is a wasteful number, since it uses less digits than its factorization.

2121212220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7315991 (or 7315989 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2121212220212 its reverse (2120222121212), we get a palindrome (4241434341424).

The spelling of 2121212220212 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, two hundred twelve".