21192028357 has 2 divisors, whose sum is σ = 21192028358. Its totient is φ = 21192028356.

The previous prime is 21192028303. The next prime is 21192028373. The reversal of 21192028357 is 75382029112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15815326081 + 5376702276 = 125759^2 + 73326^2 .

It is a cyclic number.

It is not a de Polignac number, because 21192028357 - 2¹⁹ = 21191504069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21192028057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10596014178 + 10596014179.

It is an arithmetic number, because the mean of its divisors is an integer number (10596014179).

Almost surely, 2^21192028357 is an apocalyptic number.

It is an amenable number.

21192028357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21192028357 is an equidigital number, since it uses as much as digits as its factorization.

21192028357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 21192028357 in words is "twenty-one billion, one hundred ninety-two million, twenty-eight thousand, three hundred fifty-seven".