21221022111 has 8 divisors (see below), whose sum is σ = 28402281600. Its totient is φ = 14093555352.

The previous prime is 21221022103. The next prime is 21221022113. The reversal of 21221022111 is 11122012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21221022111 - 2³ = 21221022103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221022113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13447261 + ... + 13448838.

It is an arithmetic number, because the mean of its divisors is an integer number (3550285200).

Almost surely, 2^21221022111 is an apocalyptic number.

21221022111 is a deficient number, since it is larger than the sum of its proper divisors (7181259489).

21221022111 is a wasteful number, since it uses less digits than its factorization.

21221022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26896365.

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

Adding to 21221022111 its reverse (11122012212), we get a palindrome (32343034323).

The spelling of 21221022111 in words is "twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred eleven".