212186822642 has 4 divisors (see below), whose sum is σ = 318280233966. Its totient is φ = 106093411320.

The previous prime is 212186822629. The next prime is 212186822657. The reversal of 212186822642 is 246228681212.

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

It can be written as a sum of positive squares in only one way, i.e., 156278693041 + 55908129601 = 395321^2 + 236449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212186822593 and 212186822602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53046705659 + ... + 53046705662.

Almost surely, 2^212186822642 is an apocalyptic number.

212186822642 is a deficient number, since it is larger than the sum of its proper divisors (106093411324).

212186822642 is a wasteful number, since it uses less digits than its factorization.

212186822642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106093411323.

The product of its digits is 294912, while the sum is 44.

The spelling of 212186822642 in words is "two hundred twelve billion, one hundred eighty-six million, eight hundred twenty-two thousand, six hundred forty-two".