212691473999 has 4 divisors (see below), whose sum is σ = 213334046760. Its totient is φ = 212048901240.

The previous prime is 212691473893. The next prime is 212691474019. The reversal of 212691473999 is 999374196212.

212691473999 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 is a cyclic number.

It is not a de Polignac number, because 212691473999 - 2¹⁶ = 212691408463 is a prime.

It is a super-2 number, since 2×212691473999² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212691473699) 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, 321285884 + ... + 321286545.

It is an arithmetic number, because the mean of its divisors is an integer number (53333511690).

Almost surely, 2^212691473999 is an apocalyptic number.

212691473999 is a deficient number, since it is larger than the sum of its proper divisors (642572761).

212691473999 is an equidigital number, since it uses as much as digits as its factorization.

212691473999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642572760.

The product of its digits is 13226976, while the sum is 62.

The spelling of 212691473999 in words is "two hundred twelve billion, six hundred ninety-one million, four hundred seventy-three thousand, nine hundred ninety-nine".