20211121001 has 4 divisors (see below), whose sum is σ = 20213791104. Its totient is φ = 20208450900.

The previous prime is 20211120991. The next prime is 20211121013. The reversal of 20211121001 is 10012111202.

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 20211121001 - 2¹⁰ = 20211119977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1323665 + ... + 1338846.

It is an arithmetic number, because the mean of its divisors is an integer number (5053447776).

Almost surely, 2^20211121001 is an apocalyptic number.

It is an amenable number.

20211121001 is a deficient number, since it is larger than the sum of its proper divisors (2670103).

20211121001 is an equidigital number, since it uses as much as digits as its factorization.

20211121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670102.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20211121001 its reverse (10012111202), we get a palindrome (30223232203).

The spelling of 20211121001 in words is "twenty billion, two hundred eleven million, one hundred twenty-one thousand, one".