20334101621 has 2 divisors, whose sum is σ = 20334101622. Its totient is φ = 20334101620.

The previous prime is 20334101617. The next prime is 20334101633. The reversal of 20334101621 is 12610143302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14201488900 + 6132612721 = 119170^2 + 78311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20334101621 - 2² = 20334101617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20334101681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10167050810 + 10167050811.

It is an arithmetic number, because the mean of its divisors is an integer number (10167050811).

Almost surely, 2^20334101621 is an apocalyptic number.

It is an amenable number.

20334101621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20334101621 is an equidigital number, since it uses as much as digits as its factorization.

20334101621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20334101621 its reverse (12610143302), we get a palindrome (32944244923).

The spelling of 20334101621 in words is "twenty billion, three hundred thirty-four million, one hundred one thousand, six hundred twenty-one".