6189331721921 has 2 divisors, whose sum is σ = 6189331721922. Its totient is φ = 6189331721920.

The previous prime is 6189331721791. The next prime is 6189331721927. The reversal of 6189331721921 is 1291271339816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5048357391025 + 1140974330896 = 2246855^2 + 1068164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6189331721921 is a prime.

It is not a weakly prime, because it can be changed into another prime (6189331721927) 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, 3094665860960 + 3094665860961.

It is an arithmetic number, because the mean of its divisors is an integer number (3094665860961).

Almost surely, 2^{6189331721921} is an apocalyptic number.

It is an amenable number.

6189331721921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6189331721921 is an equidigital number, since it uses as much as digits as its factorization.

6189331721921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The spelling of 6189331721921 in words is "six trillion, one hundred eighty-nine billion, three hundred thirty-one million, seven hundred twenty-one thousand, nine hundred twenty-one".