21395878146181 has 16 divisors (see below), whose sum is σ = 28079347944960. Its totient is φ = 15794633216880.

The previous prime is 21395878146121. The next prime is 21395878146217. The reversal of 21395878146181 is 18164187859312.

It is not a de Polignac number, because 21395878146181 - 2¹¹ = 21395878144133 is a prime.

It is a super-2 number, since 2×21395878146181² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395878146121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7312328731 + ... + 7312331656.

It is an arithmetic number, because the mean of its divisors is an integer number (1754959246560).

Almost surely, 2^{21395878146181} is an apocalyptic number.

It is an amenable number.

21395878146181 is a deficient number, since it is larger than the sum of its proper divisors (6683469798779).

21395878146181 is a wasteful number, since it uses less digits than its factorization.

21395878146181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14624660424.

The product of its digits is 23224320, while the sum is 64.

The spelling of 21395878146181 in words is "twenty-one trillion, three hundred ninety-five billion, eight hundred seventy-eight million, one hundred forty-six thousand, one hundred eighty-one".