215532101 has 8 divisors (see below), whose sum is σ = 218557440. Its totient is φ = 212520352.

The previous prime is 215532061. The next prime is 215532139. The reversal of 215532101 is 101235512.

It is a happy number.

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 215532101 - 2¹⁴ = 215515717 is a prime.

It is a super-2 number, since 2×215532101² = 92908173122948402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215532301) 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, 30926 + ... + 37248.

It is an arithmetic number, because the mean of its divisors is an integer number (27319680).

Almost surely, 2^215532101 is an apocalyptic number.

It is an amenable number.

215532101 is a deficient number, since it is larger than the sum of its proper divisors (3025339).

215532101 is an equidigital number, since it uses as much as digits as its factorization.

215532101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 215532101 is about 14681.0115795881. The cubic root of 215532101 is about 599.5664469803.

Adding to 215532101 its reverse (101235512), we get a palindrome (316767613).

The spelling of 215532101 in words is "two hundred fifteen million, five hundred thirty-two thousand, one hundred one".