21212221022211 has 16 divisors (see below), whose sum is σ = 28310270900480. Its totient is φ = 14127832395360.

The previous prime is 21212221022149. The next prime is 21212221022243. The reversal of 21212221022211 is 11222012221212.

It is not a de Polignac number, because 21212221022211 - 2²³ = 21212212633603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212221022261) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12314556 + ... + 13930998.

It is an arithmetic number, because the mean of its divisors is an integer number (1769391931280).

Almost surely, 2^{21212221022211} is an apocalyptic number.

21212221022211 is a deficient number, since it is larger than the sum of its proper divisors (7098049878269).

21212221022211 is a wasteful number, since it uses less digits than its factorization.

21212221022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620666.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21212221022211 its reverse (11222012221212), we get a palindrome (32434233243423).

The spelling of 21212221022211 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, twenty-two thousand, two hundred eleven".