21122656164555 has 32 divisors (see below), whose sum is σ = 36868916102400. Its totient is φ = 10241210090880.

The previous prime is 21122656164553. The next prime is 21122656164559. The reversal of 21122656164555 is 55546165622112.

It is a happy number.

It is not a de Polignac number, because 21122656164555 - 2¹ = 21122656164553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21122656164498 and 21122656164507.

It is not an unprimeable number, because it can be changed into a prime (21122656164553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25519596 + ... + 26334294.

It is an arithmetic number, because the mean of its divisors is an integer number (1152153628200).

Almost surely, 2^{21122656164555} is an apocalyptic number.

21122656164555 is a deficient number, since it is larger than the sum of its proper divisors (15746259937845).

21122656164555 is a wasteful number, since it uses less digits than its factorization.

21122656164555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971851.

The product of its digits is 4320000, while the sum is 51.

The spelling of 21122656164555 in words is "twenty-one trillion, one hundred twenty-two billion, six hundred fifty-six million, one hundred sixty-four thousand, five hundred fifty-five".