21300231615601 has 2 divisors, whose sum is σ = 21300231615602. Its totient is φ = 21300231615600.

The previous prime is 21300231615563. The next prime is 21300231615629. The reversal of 21300231615601 is 10651613200312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20499170815201 + 801060800400 = 4527601^2 + 895020^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300231615601 - 2¹³ = 21300231607409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300231615671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650115807800 + 10650115807801.

It is an arithmetic number, because the mean of its divisors is an integer number (10650115807801).

Almost surely, 2^{21300231615601} is an apocalyptic number.

It is an amenable number.

21300231615601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300231615601 is an equidigital number, since it uses as much as digits as its factorization.

21300231615601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 21300231615601 its reverse (10651613200312), we get a palindrome (31951844815913).

The spelling of 21300231615601 in words is "twenty-one trillion, three hundred billion, two hundred thirty-one million, six hundred fifteen thousand, six hundred one".