215000121 has 16 divisors (see below), whose sum is σ = 328019328. Its totient is φ = 122707200.

The previous prime is 215000117. The next prime is 215000167. The reversal of 215000121 is 121000512.

It is not a de Polignac number, because 215000121 - 2² = 215000117 is a prime.

It is a super-3 number, since 3×215000121³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215000097 and 215000106.

It is not an unprimeable number, because it can be changed into a prime (215000101) 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, 12691 + ... + 24311.

It is an arithmetic number, because the mean of its divisors is an integer number (20501208).

Almost surely, 2^215000121 is an apocalyptic number.

215000121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

215000121 is a deficient number, since it is larger than the sum of its proper divisors (113019207).

215000121 is a wasteful number, since it uses less digits than its factorization.

215000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12512.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 215000121 is about 14662.8824246804. The cubic root of 215000121 is about 599.0727538737.

Adding to 215000121 its reverse (121000512), we get a palindrome (336000633).

The spelling of 215000121 in words is "two hundred fifteen million, one hundred twenty-one", and thus it is an aban number.