215112121 has 8 divisors (see below), whose sum is σ = 246248384. Its totient is φ = 184077360.

The previous prime is 215112119. The next prime is 215112133. The reversal of 215112121 is 121211512.

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

It is a cyclic number.

It is not a de Polignac number, because 215112121 - 2¹ = 215112119 is a prime.

It is a super-2 number, since 2×215112121² = 92546449202237282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215112095 and 215112104.

It is not an unprimeable number, because it can be changed into a prime (215112421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20775 + ... + 29356.

It is an arithmetic number, because the mean of its divisors is an integer number (30781048).

Almost surely, 2^215112121 is an apocalyptic number.

It is an amenable number.

215112121 is a deficient number, since it is larger than the sum of its proper divisors (31136263).

215112121 is an equidigital number, since it uses as much as digits as its factorization.

215112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50751.

The product of its digits is 40, while the sum is 16.

The square root of 215112121 is about 14666.7010946566. The cubic root of 215112121 is about 599.1767607934.

Adding to 215112121 its reverse (121211512), we get a palindrome (336323633).

It can be divided in two parts, 21511 and 2121, that added together give a palindrome (23632).

The spelling of 215112121 in words is "two hundred fifteen million, one hundred twelve thousand, one hundred twenty-one".