21020122211 has 16 divisors (see below), whose sum is σ = 23935281408. Its totient is φ = 18272839200.

The previous prime is 21020122177. The next prime is 21020122223. The reversal of 21020122211 is 11222102012.

It is not a de Polignac number, because 21020122211 - 2⁶ = 21020122147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020122241) 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, 980396 + ... + 1001606.

It is an arithmetic number, because the mean of its divisors is an integer number (1495955088).

Almost surely, 2^21020122211 is an apocalyptic number.

21020122211 is a deficient number, since it is larger than the sum of its proper divisors (2915159197).

21020122211 is a wasteful number, since it uses less digits than its factorization.

21020122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25162.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020122211 its reverse (11222102012), we get a palindrome (32242224223).

The spelling of 21020122211 in words is "twenty-one billion, twenty million, one hundred twenty-two thousand, two hundred eleven".