20211310121 has 4 divisors (see below), whose sum is σ = 20258204544. Its totient is φ = 20164415700.

The previous prime is 20211310117. The next prime is 20211310129. The reversal of 20211310121 is 12101311202.

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 20211310121 - 2² = 20211310117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211310096 and 20211310105.

It is not an unprimeable number, because it can be changed into a prime (20211310129) 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, 23446565 + ... + 23447426.

It is an arithmetic number, because the mean of its divisors is an integer number (5064551136).

Almost surely, 2^20211310121 is an apocalyptic number.

It is an amenable number.

20211310121 is a deficient number, since it is larger than the sum of its proper divisors (46894423).

20211310121 is an equidigital number, since it uses as much as digits as its factorization.

20211310121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46894422.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20211310121 its reverse (12101311202), we get a palindrome (32312621323).

The spelling of 20211310121 in words is "twenty billion, two hundred eleven million, three hundred ten thousand, one hundred twenty-one".