212994891869 has 4 divisors (see below), whose sum is σ = 213050175996. Its totient is φ = 212939607744.

The previous prime is 212994891841. The next prime is 212994891881. The reversal of 212994891869 is 968198499212.

212994891869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 167514211225 + 45480680644 = 409285^2 + 213262^2 .

It is a cyclic number.

It is not a de Polignac number, because 212994891869 - 2¹² = 212994887773 is a prime.

It is a super-2 number, since 2×212994891869² (a number of 23 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 = 212994891799 and 212994891808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212994891829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27636284 + ... + 27643989.

It is an arithmetic number, because the mean of its divisors is an integer number (53262543999).

Almost surely, 2^212994891869 is an apocalyptic number.

It is an amenable number.

212994891869 is a deficient number, since it is larger than the sum of its proper divisors (55284127).

212994891869 is an equidigital number, since it uses as much as digits as its factorization.

212994891869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55284126.

The product of its digits is 40310784, while the sum is 68.

The spelling of 212994891869 in words is "two hundred twelve billion, nine hundred ninety-four million, eight hundred ninety-one thousand, eight hundred sixty-nine".