20337326921 has 2 divisors, whose sum is σ = 20337326922. Its totient is φ = 20337326920.

The previous prime is 20337326839. The next prime is 20337326941. The reversal of 20337326921 is 12962373302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15187111696 + 5150215225 = 123236^2 + 71765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20337326921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20337326941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10168663460 + 10168663461.

It is an arithmetic number, because the mean of its divisors is an integer number (10168663461).

Almost surely, 2^20337326921 is an apocalyptic number.

It is an amenable number.

20337326921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20337326921 is an equidigital number, since it uses as much as digits as its factorization.

20337326921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 38.

The spelling of 20337326921 in words is "twenty billion, three hundred thirty-seven million, three hundred twenty-six thousand, nine hundred twenty-one".