21112001030121 has 4 divisors (see below), whose sum is σ = 28149334706832. Its totient is φ = 14074667353412.

The previous prime is 21112001030077. The next prime is 21112001030143. The reversal of 21112001030121 is 12103010021112.

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 21112001030121 - 2¹⁷ = 21112000899049 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112001030121.

It is not an unprimeable number, because it can be changed into a prime (21112001030191) 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, 3518666838351 + ... + 3518666838356.

It is an arithmetic number, because the mean of its divisors is an integer number (7037333676708).

Almost surely, 2^{21112001030121} is an apocalyptic number.

It is an amenable number.

21112001030121 is a deficient number, since it is larger than the sum of its proper divisors (7037333676711).

21112001030121 is an equidigital number, since it uses as much as digits as its factorization.

21112001030121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037333676710.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21112001030121 its reverse (12103010021112), we get a palindrome (33215011051233).

The spelling of 21112001030121 in words is "twenty-one trillion, one hundred twelve billion, one million, thirty thousand, one hundred twenty-one".