21221000022111 has 24 divisors (see below), whose sum is σ = 28520146564272. Its totient is φ = 14035477497600.

The previous prime is 21221000022109. The next prime is 21221000022139. The reversal of 21221000022111 is 11122000012212.

It is not a de Polignac number, because 21221000022111 - 2¹ = 21221000022109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221000022161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193572765 + ... + 193682361.

It is an arithmetic number, because the mean of its divisors is an integer number (1188339440178).

Almost surely, 2^{21221000022111} is an apocalyptic number.

21221000022111 is a deficient number, since it is larger than the sum of its proper divisors (7299146542161).

21221000022111 is a wasteful number, since it uses less digits than its factorization.

21221000022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113623 (or 113492 counting only the distinct ones).

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

Adding to 21221000022111 its reverse (11122000012212), we get a palindrome (32343000034323).

The spelling of 21221000022111 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two thousand, one hundred eleven".