135541023221 has 4 divisors (see below), whose sum is σ = 135542647200. Its totient is φ = 135539399244.

The previous prime is 135541023209. The next prime is 135541023227. The reversal of 135541023221 is 122320145531.

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 135541023221 - 2¹⁴ = 135541006837 is a prime.

It is a super-2 number, since 2×135541023221² (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 (135541023227) 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, 679601 + ... + 856118.

It is an arithmetic number, because the mean of its divisors is an integer number (33885661800).

Almost surely, 2^135541023221 is an apocalyptic number.

It is an amenable number.

135541023221 is a deficient number, since it is larger than the sum of its proper divisors (1623979).

135541023221 is an equidigital number, since it uses as much as digits as its factorization.

135541023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623978.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 135541023221 its reverse (122320145531), we get a palindrome (257861168752).

The spelling of 135541023221 in words is "one hundred thirty-five billion, five hundred forty-one million, twenty-three thousand, two hundred twenty-one".