135221019 has 8 divisors (see below), whose sum is σ = 180349440. Its totient is φ = 90119976.

The previous prime is 135220973. The next prime is 135221033. The reversal of 135221019 is 910122531.

135221019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135221019 - 2⁸ = 135220763 is a prime.

It is a super-2 number, since 2×135221019² = 36569447958796722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135221019.

It is not an unprimeable number, because it can be changed into a prime (135221089) 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, 12474 + ... + 20640.

It is an arithmetic number, because the mean of its divisors is an integer number (22543680).

Almost surely, 2^135221019 is an apocalyptic number.

135221019 is a deficient number, since it is larger than the sum of its proper divisors (45128421).

135221019 is an equidigital number, since it uses as much as digits as its factorization.

135221019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13689.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 135221019 is about 11628.4572923497. The cubic root of 135221019 is about 513.2725848260.

It can be divided in two parts, 13522 and 1019, that added together give a palindrome (14541).

The spelling of 135221019 in words is "one hundred thirty-five million, two hundred twenty-one thousand, nineteen".