135551021320 has 512 divisors, whose sum is σ = 389754892800. Its totient is φ = 41693184000.

The previous prime is 135551021317. The next prime is 135551021323. The reversal of 135551021320 is 23120155531.

It is an interprime number because it is at equal distance from previous prime (135551021317) and next prime (135551021323).

It is not an unprimeable number, because it can be changed into a prime (135551021323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 581763924 + ... + 581764156.

It is an arithmetic number, because the mean of its divisors is an integer number (761240025).

Almost surely, 2^135551021320 is an apocalyptic number.

135551021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135551021320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194877446400).

135551021320 is an abundant number, since it is smaller than the sum of its proper divisors (254203871480).

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

135551021320 is a wasteful number, since it uses less digits than its factorization.

135551021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 135551021320 its reverse (23120155531), we get a palindrome (158671176851).

The spelling of 135551021320 in words is "one hundred thirty-five billion, five hundred fifty-one million, twenty-one thousand, three hundred twenty".