215135332397 has 4 divisors (see below), whose sum is σ = 215785288416. Its totient is φ = 214485376380.

The previous prime is 215135332393. The next prime is 215135332421. The reversal of 215135332397 is 793233531512.

It is a happy number.

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 215135332397 - 2² = 215135332393 is a prime.

It is a super-2 number, since 2×215135332397² (a number of 23 digits) 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 (215135332393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324977513 + ... + 324978174.

It is an arithmetic number, because the mean of its divisors is an integer number (53946322104).

Almost surely, 2^215135332397 is an apocalyptic number.

It is an amenable number.

215135332397 is a deficient number, since it is larger than the sum of its proper divisors (649956019).

215135332397 is an equidigital number, since it uses as much as digits as its factorization.

215135332397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649956018.

The product of its digits is 510300, while the sum is 44.

The spelling of 215135332397 in words is "two hundred fifteen billion, one hundred thirty-five million, three hundred thirty-two thousand, three hundred ninety-seven".