210145215 has 32 divisors (see below), whose sum is σ = 384975360. Its totient is φ = 95889024.

The previous prime is 210145207. The next prime is 210145217. The reversal of 210145215 is 512541012.

It is not a de Polignac number, because 210145215 - 2³ = 210145207 is a prime.

It is a super-2 number, since 2×210145215² = 88322022774792450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 210145191 and 210145200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210145217) 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 31 ways as a sum of consecutive naturals, for example, 67677 + ... + 70713.

It is an arithmetic number, because the mean of its divisors is an integer number (12030480).

Almost surely, 2^210145215 is an apocalyptic number.

210145215 is a deficient number, since it is larger than the sum of its proper divisors (174830145).

210145215 is a wasteful number, since it uses less digits than its factorization.

210145215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 210145215 is about 14496.3862738270. The cubic root of 210145215 is about 594.5291711092.

Adding to 210145215 its reverse (512541012), we get a palindrome (722686227).

The spelling of 210145215 in words is "two hundred ten million, one hundred forty-five thousand, two hundred fifteen".