21455005110101 has 2 divisors, whose sum is σ = 21455005110102. Its totient is φ = 21455005110100.

The previous prime is 21455005110053. The next prime is 21455005110109. The reversal of 21455005110101 is 10101150055412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21346931835076 + 108073275025 = 4620274^2 + 328745^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455005110101 - 2⁶ = 21455005110037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21455005110109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727502555050 + 10727502555051.

It is an arithmetic number, because the mean of its divisors is an integer number (10727502555051).

Almost surely, 2^{21455005110101} is an apocalyptic number.

It is an amenable number.

21455005110101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455005110101 is an equidigital number, since it uses as much as digits as its factorization.

21455005110101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 21455005110101 its reverse (10101150055412), we get a palindrome (31556155165513).

The spelling of 21455005110101 in words is "twenty-one trillion, four hundred fifty-five billion, five million, one hundred ten thousand, one hundred one".