212208125731 has 8 divisors (see below), whose sum is σ = 242754335744. Its totient is φ = 181719606600.

The previous prime is 212208125729. The next prime is 212208125749. The reversal of 212208125731 is 137521802212.

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

It is not a de Polignac number, because 212208125731 - 2¹ = 212208125729 is a prime.

It is a super-2 number, since 2×212208125731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212208125531) 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 7 ways as a sum of consecutive naturals, for example, 14414835 + ... + 14429548.

It is an arithmetic number, because the mean of its divisors is an integer number (30344291968).

Almost surely, 2^212208125731 is an apocalyptic number.

212208125731 is a deficient number, since it is larger than the sum of its proper divisors (30546210013).

212208125731 is a wasteful number, since it uses less digits than its factorization.

212208125731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28845441.

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 212208125731 its reverse (137521802212), we get a palindrome (349729927943).

The spelling of 212208125731 in words is "two hundred twelve billion, two hundred eight million, one hundred twenty-five thousand, seven hundred thirty-one".