215210125 has 16 divisors (see below), whose sum is σ = 289244592. Its totient is φ = 158923200.

The previous prime is 215210101. The next prime is 215210143. The reversal of 215210125 is 521012512.

It can be written as a sum of positive squares in 8 ways, for example, as 55920484 + 159289641 = 7478^2 + 12621^2 .

It is not a de Polignac number, because 215210125 - 2⁷ = 215209997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64594 + ... + 67843.

It is an arithmetic number, because the mean of its divisors is an integer number (18077787).

Almost surely, 2^215210125 is an apocalyptic number.

215210125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215210125 is a deficient number, since it is larger than the sum of its proper divisors (74034467).

215210125 is a wasteful number, since it uses less digits than its factorization.

215210125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132465 (or 132455 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 215210125 is about 14670.0417518152. The cubic root of 215210125 is about 599.2677409506.

Adding to 215210125 its reverse (521012512), we get a palindrome (736222637).

The spelling of 215210125 in words is "two hundred fifteen million, two hundred ten thousand, one hundred twenty-five".