13405421520 has 120 divisors (see below), whose sum is σ = 45589939200. Its totient is φ = 3529513728.

The previous prime is 13405421507. The next prime is 13405421551. The reversal of 13405421520 is 2512450431.

13405421520 is a `hidden beast` number, since 134 + 0 + 5 + 4 + 2 + 1 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×13405421520² (a number of 21 digits) contains 22 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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60960 + ... + 174719.

It is an arithmetic number, because the mean of its divisors is an integer number (379916160).

Almost surely, 2^13405421520 is an apocalyptic number.

13405421520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13405421520 is an abundant number, since it is smaller than the sum of its proper divisors (32184517680).

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

13405421520 is a wasteful number, since it uses less digits than its factorization.

13405421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235777 (or 235768 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 13405421520 its reverse (2512450431), we get a palindrome (15917871951).

The spelling of 13405421520 in words is "thirteen billion, four hundred five million, four hundred twenty-one thousand, five hundred twenty".