20113432021 has 4 divisors (see below), whose sum is σ = 20153740000. Its totient is φ = 20073124044.

The previous prime is 20113432013. The next prime is 20113432039. The reversal of 20113432021 is 12023431102.

It is a happy number.

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 20113432021 - 2³ = 20113432013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20113432021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113432051) 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, 20153241 + ... + 20154238.

It is an arithmetic number, because the mean of its divisors is an integer number (5038435000).

Almost surely, 2^20113432021 is an apocalyptic number.

It is an amenable number.

20113432021 is a deficient number, since it is larger than the sum of its proper divisors (40307979).

20113432021 is an equidigital number, since it uses as much as digits as its factorization.

20113432021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40307978.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20113432021 its reverse (12023431102), we get a palindrome (32136863123).

The spelling of 20113432021 in words is "twenty billion, one hundred thirteen million, four hundred thirty-two thousand, twenty-one".