21221121000111 has 32 divisors (see below), whose sum is σ = 30292779168000. Its totient is φ = 13175616883968.

The previous prime is 21221121000091. The next prime is 21221121000139. The reversal of 21221121000111 is 11100012112212.

It is a happy number.

It is not a de Polignac number, because 21221121000111 - 2¹⁰ = 21221120999087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221121000181) 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, 11212401 + ... + 12967658.

It is an arithmetic number, because the mean of its divisors is an integer number (946649349000).

Almost surely, 2^{21221121000111} is an apocalyptic number.

21221121000111 is a deficient number, since it is larger than the sum of its proper divisors (9071658167889).

21221121000111 is a wasteful number, since it uses less digits than its factorization.

21221121000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24180343.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221121000111 its reverse (11100012112212), we get a palindrome (32321133112323).

The spelling of 21221121000111 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven", and thus it is an aban number.