212015123545 has 8 divisors (see below), whose sum is σ = 254460327624. Its totient is φ = 169583979264.

The previous prime is 212015123479. The next prime is 212015123591. The reversal of 212015123545 is 545321510212.

It can be written as a sum of positive squares in 4 ways, for example, as 41631097369 + 170384026176 = 204037^2 + 412776^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212015123545 - 2¹⁹ = 212014599257 is a prime.

It is a super-2 number, since 2×212015123545² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 3481744 + ... + 3542113.

It is an arithmetic number, because the mean of its divisors is an integer number (31807540953).

Almost surely, 2^212015123545 is an apocalyptic number.

It is an amenable number.

212015123545 is a deficient number, since it is larger than the sum of its proper divisors (42445204079).

212015123545 is an equidigital number, since it uses as much as digits as its factorization.

212015123545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7029899.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 212015123545 its reverse (545321510212), we get a palindrome (757336633757).

The spelling of 212015123545 in words is "two hundred twelve billion, fifteen million, one hundred twenty-three thousand, five hundred forty-five".