42100215 has 16 divisors (see below), whose sum is σ = 67478400. Its totient is φ = 22414112.

The previous prime is 42100213. The next prime is 42100229. The reversal of 42100215 is 51200124.

It is a cyclic number.

It is not a de Polignac number, because 42100215 - 2¹ = 42100213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 42100194 and 42100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42100213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7756 + ... + 12014.

It is an arithmetic number, because the mean of its divisors is an integer number (4217400).

Almost surely, 2^42100215 is an apocalyptic number.

42100215 is a deficient number, since it is larger than the sum of its proper divisors (25378185).

42100215 is a wasteful number, since it uses less digits than its factorization.

42100215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 42100215 is about 6488.4678468803. The cubic root of 42100215 is about 347.8789131507.

Adding to 42100215 its reverse (51200124), we get a palindrome (93300339).

Subtracting 42100215 from its reverse (51200124), we obtain a palindrome (9099909).

The spelling of 42100215 in words is "forty-two million, one hundred thousand, two hundred fifteen".