21013000123201 has 2 divisors, whose sum is σ = 21013000123202. Its totient is φ = 21013000123200.

The previous prime is 21013000123169. The next prime is 21013000123259. The reversal of 21013000123201 is 10232100031012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20193339690000 + 819660433201 = 4493700^2 + 905351^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013000123201 - 2⁵ = 21013000123169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013000123301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506500061600 + 10506500061601.

It is an arithmetic number, because the mean of its divisors is an integer number (10506500061601).

Almost surely, 2^{21013000123201} is an apocalyptic number.

It is an amenable number.

21013000123201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013000123201 is an equidigital number, since it uses as much as digits as its factorization.

21013000123201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21013000123201 its reverse (10232100031012), we get a palindrome (31245100154213).

The spelling of 21013000123201 in words is "twenty-one trillion, thirteen billion, one hundred twenty-three thousand, two hundred one".