135577421 has 4 divisors (see below), whose sum is σ = 154945632. Its totient is φ = 116209212.

The previous prime is 135577367. The next prime is 135577423. The reversal of 135577421 is 124775531.

135577421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124775531 = 1019 ⋅122449.

It is not a de Polignac number, because 135577421 - 2⁶ = 135577357 is a prime.

It is a super-2 number, since 2×135577421² = 36762474170022482, 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 (135577423) 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, 9684095 + ... + 9684108.

It is an arithmetic number, because the mean of its divisors is an integer number (38736408).

Almost surely, 2^135577421 is an apocalyptic number.

It is an amenable number.

135577421 is a deficient number, since it is larger than the sum of its proper divisors (19368211).

135577421 is an equidigital number, since it uses as much as digits as its factorization.

135577421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19368210.

The product of its digits is 29400, while the sum is 35.

The square root of 135577421 is about 11643.7717686324. The cubic root of 135577421 is about 513.7231333543.

The spelling of 135577421 in words is "one hundred thirty-five million, five hundred seventy-seven thousand, four hundred twenty-one".