12121012222021 has 4 divisors (see below), whose sum is σ = 12326453107200. Its totient is φ = 11915571336844.

The previous prime is 12121012222013. The next prime is 12121012222037. The reversal of 12121012222021 is 12022221012121.

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 12121012222021 - 2³ = 12121012222013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121012222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121012222721) 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, 102720442501 + ... + 102720442618.

It is an arithmetic number, because the mean of its divisors is an integer number (3081613276800).

Almost surely, 2^{12121012222021} is an apocalyptic number.

It is an amenable number.

12121012222021 is a deficient number, since it is larger than the sum of its proper divisors (205440885179).

12121012222021 is an equidigital number, since it uses as much as digits as its factorization.

12121012222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205440885178.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12121012222021 its reverse (12022221012121), we get a palindrome (24143233234142).

The spelling of 12121012222021 in words is "twelve trillion, one hundred twenty-one billion, twelve million, two hundred twenty-two thousand, twenty-one".