20421140411 has 4 divisors (see below), whose sum is σ = 23338446192. Its totient is φ = 17503834632.

The previous prime is 20421140393. The next prime is 20421140413. The reversal of 20421140411 is 11404112402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20421140411 - 2³⁴ = 3241271227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421140413) 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, 1458652880 + ... + 1458652893.

It is an arithmetic number, because the mean of its divisors is an integer number (5834611548).

Almost surely, 2^20421140411 is an apocalyptic number.

20421140411 is a deficient number, since it is larger than the sum of its proper divisors (2917305781).

20421140411 is an equidigital number, since it uses as much as digits as its factorization.

20421140411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917305780.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20421140411 its reverse (11404112402), we get a palindrome (31825252813).

The spelling of 20421140411 in words is "twenty billion, four hundred twenty-one million, one hundred forty thousand, four hundred eleven".