212540015 has 8 divisors (see below), whose sum is σ = 256523328. Its totient is φ = 169048480.

The previous prime is 212539997. The next prime is 212540051. The reversal of 212540015 is 510045212.

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

It is a de Polignac number, because none of the positive numbers 2^k-212540015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121991 + ... + 123720.

It is an arithmetic number, because the mean of its divisors is an integer number (32065416).

Almost surely, 2^212540015 is an apocalyptic number.

212540015 is a deficient number, since it is larger than the sum of its proper divisors (43983313).

212540015 is a wasteful number, since it uses less digits than its factorization.

212540015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245889.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212540015 is about 14578.7521756836. The cubic root of 212540015 is about 596.7790502637.

Adding to 212540015 its reverse (510045212), we get a palindrome (722585227).

The spelling of 212540015 in words is "two hundred twelve million, five hundred forty thousand, fifteen".