2101221212 has 24 divisors (see below), whose sum is σ = 3838837632. Its totient is φ = 1004454000.

The previous prime is 2101221193. The next prime is 2101221247. The reversal of 2101221212 is 2121221012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258287 + ... + 266297.

It is an arithmetic number, because the mean of its divisors is an integer number (159951568).

Almost surely, 2^2101221212 is an apocalyptic number.

It is an amenable number.

2101221212 is a deficient number, since it is larger than the sum of its proper divisors (1737616420).

2101221212 is a wasteful number, since it uses less digits than its factorization.

2101221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10889 (or 10887 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2101221212 is about 45839.0795282802. The cubic root of 2101221212 is about 1280.8273484157.

Adding to 2101221212 its reverse (2121221012), we get a palindrome (4222442224).

It can be divided in two parts, 21012 and 21212, that added together give a palindrome (42224).

The spelling of 2101221212 in words is "two billion, one hundred one million, two hundred twenty-one thousand, two hundred twelve".