212211506 has 8 divisors (see below), whose sum is σ = 342803244. Its totient is φ = 97943760.

The previous prime is 212211487. The next prime is 212211509. The reversal of 212211506 is 605112212.

It can be written as a sum of positive squares in 2 ways, for example, as 211557025 + 654481 = 14545^2 + 809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×212211506³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212211509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080965 + ... + 4081016.

Almost surely, 2^212211506 is an apocalyptic number.

212211506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

212211506 is a deficient number, since it is larger than the sum of its proper divisors (130591738).

212211506 is a wasteful number, since it uses less digits than its factorization.

212211506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8161996.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 212211506 is about 14567.4811137684. The cubic root of 212211506 is about 596.4714244556.

Adding to 212211506 its reverse (605112212), we get a palindrome (817323718).

The spelling of 212211506 in words is "two hundred twelve million, two hundred eleven thousand, five hundred six".