21221441111 has 8 divisors (see below), whose sum is σ = 22980126624. Its totient is φ = 19480793760.

The previous prime is 21221441089. The next prime is 21221441117. The reversal of 21221441111 is 11114412212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221441111 - 2¹⁸ = 21221178967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221441117) 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, 4507091 + ... + 4511796.

It is an arithmetic number, because the mean of its divisors is an integer number (2872515828).

Almost surely, 2^21221441111 is an apocalyptic number.

21221441111 is a deficient number, since it is larger than the sum of its proper divisors (1758685513).

21221441111 is a wasteful number, since it uses less digits than its factorization.

21221441111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019081.

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

Adding to 21221441111 its reverse (11114412212), we get a palindrome (32335853323).

The spelling of 21221441111 in words is "twenty-one billion, two hundred twenty-one million, four hundred forty-one thousand, one hundred eleven".