20031121441 has 4 divisors (see below), whose sum is σ = 20313249984. Its totient is φ = 19748992900.

The previous prime is 20031121427. The next prime is 20031121459. The reversal of 20031121441 is 14412113002.

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 20031121441 - 2³³ = 11441186849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031121841) 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, 141064165 + ... + 141064306.

It is an arithmetic number, because the mean of its divisors is an integer number (5078312496).

Almost surely, 2^20031121441 is an apocalyptic number.

It is an amenable number.

20031121441 is a deficient number, since it is larger than the sum of its proper divisors (282128543).

20031121441 is an equidigital number, since it uses as much as digits as its factorization.

20031121441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282128542.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20031121441 its reverse (14412113002), we get a palindrome (34443234443).

The spelling of 20031121441 in words is "twenty billion, thirty-one million, one hundred twenty-one thousand, four hundred forty-one".