21121211202023 has 4 divisors (see below), whose sum is σ = 21121437212568. Its totient is φ = 21120985191480.

The previous prime is 21121211201947. The next prime is 21121211202061. The reversal of 21121211202023 is 32020211212112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21121211202023 - 2¹⁸ = 21121210939879 is a prime.

It is a super-2 number, since 2×21121211202023² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121211201986 and 21121211202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121211202323) 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, 112865036 + ... + 113052017.

It is an arithmetic number, because the mean of its divisors is an integer number (5280359303142).

Almost surely, 2^{21121211202023} is an apocalyptic number.

21121211202023 is a deficient number, since it is larger than the sum of its proper divisors (226010545).

21121211202023 is an equidigital number, since it uses as much as digits as its factorization.

21121211202023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226010544.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21121211202023 its reverse (32020211212112), we get a palindrome (53141422414135).

The spelling of 21121211202023 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred two thousand, twenty-three".