20112121321 has 4 divisors (see below), whose sum is σ = 20113234000. Its totient is φ = 20111008644.

The previous prime is 20112121277. The next prime is 20112121331. The reversal of 20112121321 is 12312121102.

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 20112121321 - 2¹¹ = 20112119273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112121295 and 20112121304.

It is not an unprimeable number, because it can be changed into a prime (20112121331) 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, 528771 + ... + 565528.

It is an arithmetic number, because the mean of its divisors is an integer number (5028308500).

Almost surely, 2^20112121321 is an apocalyptic number.

It is an amenable number.

20112121321 is a deficient number, since it is larger than the sum of its proper divisors (1112679).

20112121321 is a wasteful number, since it uses less digits than its factorization.

20112121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112678.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20112121321 its reverse (12312121102), we get a palindrome (32424242423).

The spelling of 20112121321 in words is "twenty billion, one hundred twelve million, one hundred twenty-one thousand, three hundred twenty-one".