21658151093 has 2 divisors, whose sum is σ = 21658151094. Its totient is φ = 21658151092.

The previous prime is 21658151059. The next prime is 21658151101. The reversal of 21658151093 is 39015185612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21198777604 + 459373489 = 145598^2 + 21433^2 .

It is a cyclic number.

It is not a de Polignac number, because 21658151093 - 2²² = 21653956789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21658151093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21658151993) 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, 10829075546 + 10829075547.

It is an arithmetic number, because the mean of its divisors is an integer number (10829075547).

Almost surely, 2^21658151093 is an apocalyptic number.

It is an amenable number.

21658151093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21658151093 is an equidigital number, since it uses as much as digits as its factorization.

21658151093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 21658151093 in words is "twenty-one billion, six hundred fifty-eight million, one hundred fifty-one thousand, ninety-three".