20111212000221 has 8 divisors (see below), whose sum is σ = 26975517893184. Its totient is φ = 13327190387040.

The previous prime is 20111212000211. The next prime is 20111212000283. The reversal of 20111212000221 is 12200021211102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20111212000221 - 2⁹ = 20111211999709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111212000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111212000211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20071069360 + ... + 20071070361.

It is an arithmetic number, because the mean of its divisors is an integer number (3371939736648).

Almost surely, 2^{20111212000221} is an apocalyptic number.

It is an amenable number.

20111212000221 is a deficient number, since it is larger than the sum of its proper divisors (6864305892963).

20111212000221 is a wasteful number, since it uses less digits than its factorization.

20111212000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40142139891.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20111212000221 its reverse (12200021211102), we get a palindrome (32311233211323).

The spelling of 20111212000221 in words is "twenty trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty-one", and thus it is an aban number.