20401110021 has 8 divisors (see below), whose sum is σ = 27545802880. Its totient is φ = 13428578592.

The previous prime is 20401110011. The next prime is 20401110071. The reversal of 20401110021 is 12001110402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20401110021 - 2⁷ = 20401109893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20401109979 and 20401110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401110011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43040080 + ... + 43040553.

It is an arithmetic number, because the mean of its divisors is an integer number (3443225360).

Almost surely, 2^20401110021 is an apocalyptic number.

It is an amenable number.

20401110021 is a deficient number, since it is larger than the sum of its proper divisors (7144692859).

20401110021 is an equidigital number, since it uses as much as digits as its factorization.

20401110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86080715.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20401110021 its reverse (12001110402), we get a palindrome (32402220423).

The spelling of 20401110021 in words is "twenty billion, four hundred one million, one hundred ten thousand, twenty-one".