212128642855 has 4 divisors (see below), whose sum is σ = 254554371432. Its totient is φ = 169702914280.

The previous prime is 212128642841. The next prime is 212128642903. The reversal of 212128642855 is 558246821212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212128642855 - 2⁷ = 212128642727 is a prime.

It is a super-2 number, since 2×212128642855² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21212864281 + ... + 21212864290.

It is an arithmetic number, because the mean of its divisors is an integer number (63638592858).

Almost surely, 2^212128642855 is an apocalyptic number.

212128642855 is a deficient number, since it is larger than the sum of its proper divisors (42425728577).

212128642855 is an equidigital number, since it uses as much as digits as its factorization.

212128642855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42425728576.

The product of its digits is 614400, while the sum is 46.

The spelling of 212128642855 in words is "two hundred twelve billion, one hundred twenty-eight million, six hundred forty-two thousand, eight hundred fifty-five".