21355414751149 has 2 divisors, whose sum is σ = 21355414751150. Its totient is φ = 21355414751148.

The previous prime is 21355414751131. The next prime is 21355414751159. The reversal of 21355414751149 is 94115741455312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17495439390025 + 3859975361124 = 4182755^2 + 1964682^2 .

It is a cyclic number.

It is not a de Polignac number, because 21355414751149 - 2²⁵ = 21355381196717 is a prime.

It is a super-3 number, since 3×21355414751149³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21355414751096 and 21355414751105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21355414751159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677707375574 + 10677707375575.

It is an arithmetic number, because the mean of its divisors is an integer number (10677707375575).

Almost surely, 2^{21355414751149} is an apocalyptic number.

It is an amenable number.

21355414751149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355414751149 is an equidigital number, since it uses as much as digits as its factorization.

21355414751149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024000, while the sum is 52.

The spelling of 21355414751149 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fourteen million, seven hundred fifty-one thousand, one hundred forty-nine".