212198566381 has 4 divisors (see below), whose sum is σ = 223366912000. Its totient is φ = 201030220764.

The previous prime is 212198566379. The next prime is 212198566399. The reversal of 212198566381 is 183665891212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212198566381 - 2¹ = 212198566379 is a prime.

It is a super-2 number, since 2×212198566381² (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 (212198566301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5584172781 + ... + 5584172818.

It is an arithmetic number, because the mean of its divisors is an integer number (55841728000).

Almost surely, 2^212198566381 is an apocalyptic number.

It is an amenable number.

212198566381 is a deficient number, since it is larger than the sum of its proper divisors (11168345619).

212198566381 is a wasteful number, since it uses less digits than its factorization.

212198566381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11168345618.

The product of its digits is 1244160, while the sum is 52.

The spelling of 212198566381 in words is "two hundred twelve billion, one hundred ninety-eight million, five hundred sixty-six thousand, three hundred eighty-one".