21110255250401 has 2 divisors, whose sum is σ = 21110255250402. Its totient is φ = 21110255250400.

The previous prime is 21110255250397. The next prime is 21110255250407. The reversal of 21110255250401 is 10405255201112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18086137728400 + 3024117522001 = 4252780^2 + 1738999^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110255250401 - 2² = 21110255250397 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110255250407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555127625200 + 10555127625201.

It is an arithmetic number, because the mean of its divisors is an integer number (10555127625201).

Almost surely, 2^{21110255250401} is an apocalyptic number.

It is an amenable number.

21110255250401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110255250401 is an equidigital number, since it uses as much as digits as its factorization.

21110255250401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 29.

The spelling of 21110255250401 in words is "twenty-one trillion, one hundred ten billion, two hundred fifty-five million, two hundred fifty thousand, four hundred one".