21655420461145 has 32 divisors (see below), whose sum is σ = 26740429867008. Its totient is φ = 16823545579008.

The previous prime is 21655420461043. The next prime is 21655420461187. The reversal of 21655420461145 is 54116402455612.

It is a cyclic number.

It is not a de Polignac number, because 21655420461145 - 2⁴¹ = 19456397205593 is a prime.

It is a super-2 number, since 2×21655420461145² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21655420461095 and 21655420461104.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 422989669 + ... + 423040861.

It is an arithmetic number, because the mean of its divisors is an integer number (835638433344).

Almost surely, 2^{21655420461145} is an apocalyptic number.

It is an amenable number.

21655420461145 is a deficient number, since it is larger than the sum of its proper divisors (5085009405863).

21655420461145 is a wasteful number, since it uses less digits than its factorization.

21655420461145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55609.

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 21655420461145 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred twenty million, four hundred sixty-one thousand, one hundred forty-five".