20212221212 has 24 divisors (see below), whose sum is σ = 35960127840. Its totient is φ = 9938617920.

The previous prime is 20212221209. The next prime is 20212221241. The reversal of 20212221212 is 21212221202.

It is a happy number.

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, 23114 + ... + 202382.

It is an arithmetic number, because the mean of its divisors is an integer number (1498338660).

Almost surely, 2^20212221212 is an apocalyptic number.

It is an amenable number.

20212221212 is a deficient number, since it is larger than the sum of its proper divisors (15747906628).

20212221212 is a wasteful number, since it uses less digits than its factorization.

20212221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179741 (or 179739 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20212221212 its reverse (21212221202), we get a palindrome (41424442414).

The spelling of 20212221212 in words is "twenty billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twelve".