20000211211221 has 16 divisors (see below), whose sum is σ = 27042733768320. Its totient is φ = 13145584101440.

The previous prime is 20000211211121. The next prime is 20000211211229. The reversal of 20000211211221 is 12211211200002.

It is a cyclic number.

It is not a de Polignac number, because 20000211211221 - 2¹⁷ = 20000211080149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20000211211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000211211229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41382715 + ... + 41863223.

It is an arithmetic number, because the mean of its divisors is an integer number (1690170860520).

Almost surely, 2^{20000211211221} is an apocalyptic number.

It is an amenable number.

20000211211221 is a deficient number, since it is larger than the sum of its proper divisors (7042522557099).

20000211211221 is a wasteful number, since it uses less digits than its factorization.

20000211211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675996.

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

Adding to 20000211211221 its reverse (12211211200002), we get a palindrome (32211422411223).

The spelling of 20000211211221 in words is "twenty trillion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-one".