212423515 has 32 divisors (see below), whose sum is σ = 282009600. Its totient is φ = 152887680.

The previous prime is 212423513. The next prime is 212423539. The reversal of 212423515 is 515324212.

It is not a de Polignac number, because 212423515 - 2¹ = 212423513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212423515.

It is not an unprimeable number, because it can be changed into a prime (212423513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 417081 + ... + 417589.

It is an arithmetic number, because the mean of its divisors is an integer number (8812800).

Almost surely, 2^212423515 is an apocalyptic number.

212423515 is a deficient number, since it is larger than the sum of its proper divisors (69586085).

212423515 is a wasteful number, since it uses less digits than its factorization.

212423515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747.

The product of its digits is 2400, while the sum is 25.

The square root of 212423515 is about 14574.7560871529. The cubic root of 212423515 is about 596.6699924217.

Adding to 212423515 its reverse (515324212), we get a palindrome (727747727).

The spelling of 212423515 in words is "two hundred twelve million, four hundred twenty-three thousand, five hundred fifteen".