21110012202121 has 4 divisors (see below), whose sum is σ = 21110055885072. Its totient is φ = 21109968519172.

The previous prime is 21110012202077. The next prime is 21110012202161. The reversal of 21110012202121 is 12120221001112.

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 21110012202121 - 2³³ = 21101422267529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110012202095 and 21110012202104.

It is not an unprimeable number, because it can be changed into a prime (21110012202161) 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, 21108391 + ... + 22085836.

It is an arithmetic number, because the mean of its divisors is an integer number (5277513971268).

Almost surely, 2^{21110012202121} is an apocalyptic number.

It is an amenable number.

21110012202121 is a deficient number, since it is larger than the sum of its proper divisors (43682951).

21110012202121 is an equidigital number, since it uses as much as digits as its factorization.

21110012202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43682950.

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

Adding to 21110012202121 its reverse (12120221001112), we get a palindrome (33230233203233).

The spelling of 21110012202121 in words is "twenty-one trillion, one hundred ten billion, twelve million, two hundred two thousand, one hundred twenty-one".