12111221110021 has 16 divisors (see below), whose sum is σ = 13429228349376. Its totient is φ = 10829388960000.

The previous prime is 12111221109983. The next prime is 12111221110039. The reversal of 12111221110021 is 12001112211121.

It is a cyclic number.

It is not a de Polignac number, because 12111221110021 - 2⁷ = 12111221109893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111221109977 and 12111221110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111221410021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24394026 + ... + 24885556.

It is an arithmetic number, because the mean of its divisors is an integer number (839326771836).

Almost surely, 2^{12111221110021} is an apocalyptic number.

12111221110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111221110021 is a deficient number, since it is larger than the sum of its proper divisors (1318007239355).

12111221110021 is a wasteful number, since it uses less digits than its factorization.

12111221110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528324.

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

Adding to 12111221110021 its reverse (12001112211121), we get a palindrome (24112333321142).

It can be divided in two parts, 121112211100 and 21, that added together give a palindrome (121112211121).

The spelling of 12111221110021 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".