20789336102921 has 2 divisors, whose sum is σ = 20789336102922. Its totient is φ = 20789336102920.

The previous prime is 20789336102839. The next prime is 20789336102959. The reversal of 20789336102921 is 12920163398702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19236294246400 + 1553041856521 = 4385920^2 + 1246211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20789336102921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20789336102971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10394668051460 + 10394668051461.

It is an arithmetic number, because the mean of its divisors is an integer number (10394668051461).

Almost surely, 2^{20789336102921} is an apocalyptic number.

It is an amenable number.

20789336102921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20789336102921 is an equidigital number, since it uses as much as digits as its factorization.

20789336102921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 20789336102921 in words is "twenty trillion, seven hundred eighty-nine billion, three hundred thirty-six million, one hundred two thousand, nine hundred twenty-one".