21261828153069 has 96 divisors (see below), whose sum is σ = 37633169134080. Its totient is φ = 11301756719616.

The previous prime is 21261828153067. The next prime is 21261828153103. The reversal of 21261828153069 is 96035182816212.

21261828153069 is a `hidden beast` number, since 2 + 1 + 2 + 618 + 2 + 8 + 15 + 3 + 0 + 6 + 9 = 666.

It is not a de Polignac number, because 21261828153069 - 2¹ = 21261828153067 is a prime.

It is a super-2 number, since 2×21261828153069² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261828153067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 110829459 + ... + 111021135.

It is an arithmetic number, because the mean of its divisors is an integer number (392012178480).

Almost surely, 2^{21261828153069} is an apocalyptic number.

It is an amenable number.

21261828153069 is a deficient number, since it is larger than the sum of its proper divisors (16371340981011).

21261828153069 is a wasteful number, since it uses less digits than its factorization.

21261828153069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193819 (or 193816 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 21261828153069 in words is "twenty-one trillion, two hundred sixty-one billion, eight hundred twenty-eight million, one hundred fifty-three thousand, sixty-nine".