135297221 has 16 divisors (see below), whose sum is σ = 141571584. Its totient is φ = 129205104.

The previous prime is 135297199. The next prime is 135297223. The reversal of 135297221 is 122792531.

It is not a de Polignac number, because 135297221 - 2²⁶ = 68188357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135297223) 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, 595910 + ... + 596136.

It is an arithmetic number, because the mean of its divisors is an integer number (8848224).

Almost surely, 2^135297221 is an apocalyptic number.

It is an amenable number.

135297221 is a deficient number, since it is larger than the sum of its proper divisors (6274363).

135297221 is a wasteful number, since it uses less digits than its factorization.

135297221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 7560, while the sum is 32.

The square root of 135297221 is about 11631.7333617995. The cubic root of 135297221 is about 513.3689826913.

The spelling of 135297221 in words is "one hundred thirty-five million, two hundred ninety-seven thousand, two hundred twenty-one".