20001212221211 has 8 divisors (see below), whose sum is σ = 21539925976800. Its totient is φ = 18462521175552.

The previous prime is 20001212221183. The next prime is 20001212221213. The reversal of 20001212221211 is 11212221210002.

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

It is a cyclic number.

It is not a de Polignac number, because 20001212221211 - 2⁴² = 15603165710107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001212221211.

It is not an unprimeable number, because it can be changed into a prime (20001212221213) 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, 3825911 + ... + 7391888.

It is an arithmetic number, because the mean of its divisors is an integer number (2692490747100).

Almost surely, 2^{20001212221211} is an apocalyptic number.

20001212221211 is a deficient number, since it is larger than the sum of its proper divisors (1538713755589).

20001212221211 is a wasteful number, since it uses less digits than its factorization.

20001212221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11354965.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20001212221211 its reverse (11212221210002), we get a palindrome (31213433431213).

The spelling of 20001212221211 in words is "twenty trillion, one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".