12121022110021 has 4 divisors (see below), whose sum is σ = 13222933210944. Its totient is φ = 11019111009100.

The previous prime is 12121022109971. The next prime is 12121022110039. The reversal of 12121022110021 is 12001122012121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12121022110021 - 2⁷ = 12121022109893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121022109977 and 12121022110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121022110621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550955550445 + ... + 550955550466.

It is an arithmetic number, because the mean of its divisors is an integer number (3305733302736).

Almost surely, 2^{12121022110021} is an apocalyptic number.

12121022110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121022110021 is a deficient number, since it is larger than the sum of its proper divisors (1101911100923).

12121022110021 is a wasteful number, since it uses less digits than its factorization.

12121022110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101911100922.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12121022110021 its reverse (12001122012121), we get a palindrome (24122144122142).

The spelling of 12121022110021 in words is "twelve trillion, one hundred twenty-one billion, twenty-two million, one hundred ten thousand, twenty-one".