21750636944941 has 2 divisors, whose sum is σ = 21750636944942. Its totient is φ = 21750636944940.

The previous prime is 21750636944903. The next prime is 21750636944957. The reversal of 21750636944941 is 14944963605712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17797041571716 + 3953595373225 = 4218654^2 + 1988365^2 .

It is a cyclic number.

It is not a de Polignac number, because 21750636944941 - 2³⁵ = 21716277206573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21750636944941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21750636944341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875318472470 + 10875318472471.

It is an arithmetic number, because the mean of its divisors is an integer number (10875318472471).

Almost surely, 2^{21750636944941} is an apocalyptic number.

It is an amenable number.

21750636944941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21750636944941 is an equidigital number, since it uses as much as digits as its factorization.

21750636944941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 21750636944941 in words is "twenty-one trillion, seven hundred fifty billion, six hundred thirty-six million, nine hundred forty-four thousand, nine hundred forty-one".