21121121012201 has 4 divisors (see below), whose sum is σ = 24138424013952. Its totient is φ = 18103818010452.

The previous prime is 21121121012179. The next prime is 21121121012219. The reversal of 21121121012201 is 10221012112112.

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 21121121012201 - 2⁶ = 21121121012137 is a prime.

It is a super-2 number, since 2×21121121012201² (a number of 27 digits) contains 22 as substring.

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 21121121012201.

It is not an unprimeable number, because it can be changed into a prime (21121121012801) 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, 1508651500865 + ... + 1508651500878.

It is an arithmetic number, because the mean of its divisors is an integer number (6034606003488).

Almost surely, 2^{21121121012201} is an apocalyptic number.

It is an amenable number.

21121121012201 is a deficient number, since it is larger than the sum of its proper divisors (3017303001751).

21121121012201 is an equidigital number, since it uses as much as digits as its factorization.

21121121012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017303001750.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121121012201 its reverse (10221012112112), we get a palindrome (31342133124313).

The spelling of 21121121012201 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one million, twelve thousand, two hundred one".