21210221122211 has 32 divisors (see below), whose sum is σ = 23387641068288. Its totient is φ = 19075525971840.

The previous prime is 21210221122171. The next prime is 21210221122241. The reversal of 21210221122211 is 11222112201212.

It is a cyclic number.

It is not a de Polignac number, because 21210221122211 - 2³⁰ = 21209147380387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210221122241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604555076 + ... + 604590158.

It is an arithmetic number, because the mean of its divisors is an integer number (730863783384).

Almost surely, 2^{21210221122211} is an apocalyptic number.

21210221122211 is a deficient number, since it is larger than the sum of its proper divisors (2177419946077).

21210221122211 is a wasteful number, since it uses less digits than its factorization.

21210221122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36771.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21210221122211 its reverse (11222112201212), we get a palindrome (32432333323423).

The spelling of 21210221122211 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred eleven".