20111211212 has 12 divisors (see below), whose sum is σ = 35676738216. Its totient is φ = 9917857440.

The previous prime is 20111211199. The next prime is 20111211313. The reversal of 20111211212 is 21211211102.

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 3 ways as a sum of consecutive naturals, for example, 34436714 + ... + 34437297.

It is an arithmetic number, because the mean of its divisors is an integer number (2973061518).

Almost surely, 2^20111211212 is an apocalyptic number.

It is an amenable number.

20111211212 is a deficient number, since it is larger than the sum of its proper divisors (15565527004).

20111211212 is a wasteful number, since it uses less digits than its factorization.

20111211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68874088 (or 68874086 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111211212 its reverse (21211211102), we get a palindrome (41322422314).

The spelling of 20111211212 in words is "twenty billion, one hundred eleven million, two hundred eleven thousand, two hundred twelve".