20021138453 has 4 divisors (see below), whose sum is σ = 20486746368. Its totient is φ = 19555530540.

The previous prime is 20021138441. The next prime is 20021138497. The reversal of 20021138453 is 35483112002.

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 not a de Polignac number, because 20021138453 - 2¹⁰ = 20021137429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021138353) 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, 232803893 + ... + 232803978.

It is an arithmetic number, because the mean of its divisors is an integer number (5121686592).

Almost surely, 2^20021138453 is an apocalyptic number.

It is an amenable number.

20021138453 is a deficient number, since it is larger than the sum of its proper divisors (465607915).

20021138453 is an equidigital number, since it uses as much as digits as its factorization.

20021138453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465607914.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 20021138453 in words is "twenty billion, twenty-one million, one hundred thirty-eight thousand, four hundred fifty-three".