20421300133 has 8 divisors (see below), whose sum is σ = 23285826648. Its totient is φ = 17741581824.

The previous prime is 20421300083. The next prime is 20421300169. The reversal of 20421300133 is 33100312402.

It can be written as a sum of positive squares in 4 ways, for example, as 6666232609 + 13755067524 = 81647^2 + 117282^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20421300133 - 2⁹ = 20421299621 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 20421300133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421306133) 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, 46201816 + ... + 46202257.

It is an arithmetic number, because the mean of its divisors is an integer number (2910728331).

Almost surely, 2^20421300133 is an apocalyptic number.

It is an amenable number.

20421300133 is a deficient number, since it is larger than the sum of its proper divisors (2864526515).

20421300133 is a wasteful number, since it uses less digits than its factorization.

20421300133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92404103.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20421300133 its reverse (33100312402), we get a palindrome (53521612535).

The spelling of 20421300133 in words is "twenty billion, four hundred twenty-one million, three hundred thousand, one hundred thirty-three".