135421432155220 has 24 divisors (see below), whose sum is σ = 284437274802408. Its totient is φ = 54158617190400.

The previous prime is 135421432155211. The next prime is 135421432155287. The reversal of 135421432155220 is 22551234124531.

It can be written as a sum of positive squares in 4 ways, for example, as 69917725869124 + 65503706286096 = 8361682^2 + 8093436^2 .

It is a super-4 number, since 4×135421432155220⁴ (a number of 58 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622117941 + ... + 622335580.

It is an arithmetic number, because the mean of its divisors is an integer number (11851553116767).

Almost surely, 2^{135421432155220} is an apocalyptic number.

135421432155220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135421432155220 is an abundant number, since it is smaller than the sum of its proper divisors (149015842647188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135421432155220 is a wasteful number, since it uses less digits than its factorization.

135421432155220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244458971 (or 1244458969 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 135421432155220 its reverse (22551234124531), we get a palindrome (157972666279751).

The spelling of 135421432155220 in words is "one hundred thirty-five trillion, four hundred twenty-one billion, four hundred thirty-two million, one hundred fifty-five thousand, two hundred twenty".