21403005601320 has 1024 divisors, whose sum is σ = 84204748800000. Its totient is φ = 4833335162880.

The previous prime is 21403005601297. The next prime is 21403005601331. The reversal of 21403005601320 is 2310650030412.

21403005601320 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 30 + 0 + 5 + 601 + 3 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 13219891471 + ... + 13219893089.

It is an arithmetic number, because the mean of its divisors is an integer number (82231200000).

Almost surely, 2^{21403005601320} is an apocalyptic number.

21403005601320 is a gapful number since it is divisible by the number (20) 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 21403005601320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42102374400000).

21403005601320 is an abundant number, since it is smaller than the sum of its proper divisors (62801743198680).

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

21403005601320 is a wasteful number, since it uses less digits than its factorization.

21403005601320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068 (or 2044 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21403005601320 its reverse (2310650030412), we get a palindrome (23713655631732).

The spelling of 21403005601320 in words is "twenty-one trillion, four hundred three billion, five million, six hundred one thousand, three hundred twenty".