212100566623 has 32 divisors (see below), whose sum is σ = 259743456000. Its totient is φ = 170687761920.

The previous prime is 212100566581. The next prime is 212100566627. The reversal of 212100566623 is 326665001212.

It is a cyclic number.

It is not a de Polignac number, because 212100566623 - 2¹³ = 212100558431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100566627) 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, 279133 + ... + 708601.

It is an arithmetic number, because the mean of its divisors is an integer number (8116983000).

Almost surely, 2^212100566623 is an apocalyptic number.

212100566623 is a deficient number, since it is larger than the sum of its proper divisors (47642889377).

212100566623 is a wasteful number, since it uses less digits than its factorization.

212100566623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429655.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 212100566623 its reverse (326665001212), we get a palindrome (538765567835).

The spelling of 212100566623 in words is "two hundred twelve billion, one hundred million, five hundred sixty-six thousand, six hundred twenty-three".