21455000531953 has 2 divisors, whose sum is σ = 21455000531954. Its totient is φ = 21455000531952.

The previous prime is 21455000531837. The next prime is 21455000531969. The reversal of 21455000531953 is 35913500055412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21454201169424 + 799362529 = 4631868^2 + 28273^2 .

It is a cyclic number.

It is not a de Polignac number, because 21455000531953 - 2⁴¹ = 19255977276401 is a prime.

It is a super-2 number, since 2×21455000531953² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21455000534953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727500265976 + 10727500265977.

It is an arithmetic number, because the mean of its divisors is an integer number (10727500265977).

Almost surely, 2^{21455000531953} is an apocalyptic number.

It is an amenable number.

21455000531953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455000531953 is an equidigital number, since it uses as much as digits as its factorization.

21455000531953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 21455000531953 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred thirty-one thousand, nine hundred fifty-three".