21516151100501 has 2 divisors, whose sum is σ = 21516151100502. Its totient is φ = 21516151100500.

The previous prime is 21516151100429. The next prime is 21516151100617. The reversal of 21516151100501 is 10500115161512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15821890450276 + 5694260650225 = 3977674^2 + 2386265^2 .

It is a cyclic number.

It is not a de Polignac number, because 21516151100501 - 2¹⁴ = 21516151084117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21516156100501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10758075550250 + 10758075550251.

It is an arithmetic number, because the mean of its divisors is an integer number (10758075550251).

Almost surely, 2^{21516151100501} is an apocalyptic number.

It is an amenable number.

21516151100501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21516151100501 is an equidigital number, since it uses as much as digits as its factorization.

21516151100501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 29.

The spelling of 21516151100501 in words is "twenty-one trillion, five hundred sixteen billion, one hundred fifty-one million, one hundred thousand, five hundred one".