215602121 has 16 divisors (see below), whose sum is σ = 251733888. Its totient is φ = 180835200.

The previous prime is 215602087. The next prime is 215602141. The reversal of 215602121 is 121206512.

It is a de Polignac number, because none of the positive numbers 2^k-215602121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215602093 and 215602102.

It is not an unprimeable number, because it can be changed into a prime (215602141) 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, 88901 + ... + 91293.

It is an arithmetic number, because the mean of its divisors is an integer number (15733368).

Almost surely, 2^215602121 is an apocalyptic number.

It is an amenable number.

215602121 is a deficient number, since it is larger than the sum of its proper divisors (36131767).

215602121 is a wasteful number, since it uses less digits than its factorization.

215602121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 215602121 is about 14683.3960989956. The cubic root of 215602121 is about 599.6313670812.

Adding to 215602121 its reverse (121206512), we get a palindrome (336808633).

The spelling of 215602121 in words is "two hundred fifteen million, six hundred two thousand, one hundred twenty-one".