215013321 has 6 divisors (see below), whose sum is σ = 310574810. Its totient is φ = 143342208.

The previous prime is 215013311. The next prime is 215013341. The reversal of 215013321 is 123310512.

It can be written as a sum of positive squares in only one way, i.e., 123543225 + 91470096 = 11115^2 + 9564^2 .

It is not a de Polignac number, because 215013321 - 2⁶ = 215013257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215013294 and 215013303.

It is not an unprimeable number, because it can be changed into a prime (215013301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11945176 + ... + 11945193.

Almost surely, 2^215013321 is an apocalyptic number.

It is an amenable number.

215013321 is a deficient number, since it is larger than the sum of its proper divisors (95561489).

215013321 is a wasteful number, since it uses less digits than its factorization.

215013321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23890375 (or 23890372 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 215013321 is about 14663.3325339092. The cubic root of 215013321 is about 599.0850137094.

Adding to 215013321 its reverse (123310512), we get a palindrome (338323833).

The spelling of 215013321 in words is "two hundred fifteen million, thirteen thousand, three hundred twenty-one".