221736028357 has 2 divisors, whose sum is σ = 221736028358. Its totient is φ = 221736028356.

The previous prime is 221736028343. The next prime is 221736028411. The reversal of 221736028357 is 753820637122.

221736028357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201090361761 + 20645666596 = 448431^2 + 143686^2 .

It is a cyclic number.

It is not a de Polignac number, because 221736028357 - 2¹⁵ = 221735995589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221736028337) 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, 110868014178 + 110868014179.

It is an arithmetic number, because the mean of its divisors is an integer number (110868014179).

Almost surely, 2^221736028357 is an apocalyptic number.

It is an amenable number.

221736028357 is a deficient number, since it is larger than the sum of its proper divisors (1).

221736028357 is an equidigital number, since it uses as much as digits as its factorization.

221736028357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 221736028357 in words is "two hundred twenty-one billion, seven hundred thirty-six million, twenty-eight thousand, three hundred fifty-seven".