21221000202111 has 32 divisors (see below), whose sum is σ = 30062194713600. Its totient is φ = 13289983217280.

The previous prime is 21221000202097. The next prime is 21221000202119. The reversal of 21221000202111 is 11120200012212.

It is not a de Polignac number, because 21221000202111 - 2⁷ = 21221000201983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221000202119) 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, 208794696 + ... + 208896306.

It is an arithmetic number, because the mean of its divisors is an integer number (939443584800).

Almost surely, 2^{21221000202111} is an apocalyptic number.

21221000202111 is a deficient number, since it is larger than the sum of its proper divisors (8841194511489).

21221000202111 is a wasteful number, since it uses less digits than its factorization.

21221000202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166559.

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

Adding to 21221000202111 its reverse (11120200012212), we get a palindrome (32341200214323).

The spelling of 21221000202111 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two thousand, one hundred eleven".