21455450153611 has 2 divisors, whose sum is σ = 21455450153612. Its totient is φ = 21455450153610.

The previous prime is 21455450153513. The next prime is 21455450153629. The reversal of 21455450153611 is 11635105455412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21455450153611 - 2⁷ = 21455450153483 is a prime.

It is not a weakly prime, because it can be changed into another prime (21455450153681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727725076805 + 10727725076806.

It is an arithmetic number, because the mean of its divisors is an integer number (10727725076806).

Almost surely, 2^{21455450153611} is an apocalyptic number.

21455450153611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455450153611 is an equidigital number, since it uses as much as digits as its factorization.

21455450153611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 21455450153611 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, one hundred fifty-three thousand, six hundred eleven".