21093279589 has 2 divisors, whose sum is σ = 21093279590. Its totient is φ = 21093279588.

The previous prime is 21093279547. The next prime is 21093279611. The reversal of 21093279589 is 98597239012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11477908225 + 9615371364 = 107135^2 + 98058^2 .

It is a cyclic number.

It is not a de Polignac number, because 21093279589 - 2¹⁵ = 21093246821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21093279089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10546639794 + 10546639795.

It is an arithmetic number, because the mean of its divisors is an integer number (10546639795).

Almost surely, 2^21093279589 is an apocalyptic number.

It is an amenable number.

21093279589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21093279589 is an equidigital number, since it uses as much as digits as its factorization.

21093279589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 55.

It can be divided in two parts, 210932 and 79589, that added together give a square (290521 = 539²).

The spelling of 21093279589 in words is "twenty-one billion, ninety-three million, two hundred seventy-nine thousand, five hundred eighty-nine".