12121001122021 has 4 divisors (see below), whose sum is σ = 13222910314944. Its totient is φ = 11019091929100.

The previous prime is 12121001122007. The next prime is 12121001122033. The reversal of 12121001122021 is 12022110012121.

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 12121001122021 - 2²³ = 12120992733413 is a prime.

It is a super-2 number, since 2×12121001122021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12121001121986 and 12121001122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121001122091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550954596445 + ... + 550954596466.

It is an arithmetic number, because the mean of its divisors is an integer number (3305727578736).

Almost surely, 2^{12121001122021} is an apocalyptic number.

12121001122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12121001122021 is a deficient number, since it is larger than the sum of its proper divisors (1101909192923).

12121001122021 is a wasteful number, since it uses less digits than its factorization.

12121001122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101909192922.

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

Adding to 12121001122021 its reverse (12022110012121), we get a palindrome (24143111134142).

The spelling of 12121001122021 in words is "twelve trillion, one hundred twenty-one billion, one million, one hundred twenty-two thousand, twenty-one".