20111212012 has 12 divisors (see below), whose sum is σ = 35200231416. Its totient is φ = 10054003040.

The previous prime is 20111211971. The next prime is 20111212013. The reversal of 20111212012 is 21021211102.

It is a super-2 number, since 2×20111212012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111211983 and 20111212001.

It is not an unprimeable number, because it can be changed into a prime (20111212013) 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, 372289 + ... + 422872.

It is an arithmetic number, because the mean of its divisors is an integer number (2933352618).

Almost surely, 2^20111212012 is an apocalyptic number.

It is an amenable number.

20111212012 is a deficient number, since it is larger than the sum of its proper divisors (15089019404).

20111212012 is a wasteful number, since it uses less digits than its factorization.

20111212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801488 (or 801486 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20111212012 its reverse (21021211102), we get a palindrome (41132423114).

The spelling of 20111212012 in words is "twenty billion, one hundred eleven million, two hundred twelve thousand, twelve".