21648747239101 has 2 divisors, whose sum is σ = 21648747239102. Its totient is φ = 21648747239100.

The previous prime is 21648747239083. The next prime is 21648747239131. The reversal of 21648747239101 is 10193274784612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21299378765625 + 349368473476 = 4615125^2 + 591074^2 .

It is a cyclic number.

It is not a de Polignac number, because 21648747239101 - 2⁵ = 21648747239069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21648747239131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10824373619550 + 10824373619551.

It is an arithmetic number, because the mean of its divisors is an integer number (10824373619551).

Almost surely, 2^{21648747239101} is an apocalyptic number.

It is an amenable number.

21648747239101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21648747239101 is an equidigital number, since it uses as much as digits as its factorization.

21648747239101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 21648747239101 in words is "twenty-one trillion, six hundred forty-eight billion, seven hundred forty-seven million, two hundred thirty-nine thousand, one hundred one".