135545212021 has 8 divisors (see below), whose sum is σ = 138856604544. Its totient is φ = 132234077280.

The previous prime is 135545212009. The next prime is 135545212031. The reversal of 135545212021 is 120212545531.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135545212021 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 (135545212031) 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, 1403140 + ... + 1496626.

It is an arithmetic number, because the mean of its divisors is an integer number (17357075568).

Almost surely, 2^135545212021 is an apocalyptic number.

It is an amenable number.

135545212021 is a deficient number, since it is larger than the sum of its proper divisors (3311392523).

135545212021 is an equidigital number, since it uses as much as digits as its factorization.

135545212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128891.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 135545212021 its reverse (120212545531), we get a palindrome (255757757552).

The spelling of 135545212021 in words is "one hundred thirty-five billion, five hundred forty-five million, two hundred twelve thousand, twenty-one".