215002121 has 4 divisors (see below), whose sum is σ = 217592592. Its totient is φ = 212411652.

The previous prime is 215002103. The next prime is 215002141. The reversal of 215002121 is 121200512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215002121 - 2¹⁰ = 215001097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215002096 and 215002105.

It is not an unprimeable number, because it can be changed into a prime (215002141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295111 + ... + 1295276.

It is an arithmetic number, because the mean of its divisors is an integer number (54398148).

Almost surely, 2^215002121 is an apocalyptic number.

It is an amenable number.

215002121 is a deficient number, since it is larger than the sum of its proper divisors (2590471).

215002121 is an equidigital number, since it uses as much as digits as its factorization.

215002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590470.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 215002121 is about 14662.9506239365. The cubic root of 215002121 is about 599.0746114568.

Adding to 215002121 its reverse (121200512), we get a palindrome (336202633).

The spelling of 215002121 in words is "two hundred fifteen million, two thousand, one hundred twenty-one".