21404121134140 has 24 divisors (see below), whose sum is σ = 45412042575312. Its totient is φ = 8473384035840.

The previous prime is 21404121134117. The next prime is 21404121134147. The reversal of 21404121134140 is 4143112140412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21404121134099 and 21404121134108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404121134147) 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, 5516524126 + ... + 5516528005.

It is an arithmetic number, because the mean of its divisors is an integer number (1892168440638).

Almost surely, 2^{21404121134140} is an apocalyptic number.

21404121134140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404121134140 is an abundant number, since it is smaller than the sum of its proper divisors (24007921441172).

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

21404121134140 is a wasteful number, since it uses less digits than its factorization.

21404121134140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11033052237 (or 11033052235 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 21404121134140 its reverse (4143112140412), we get a palindrome (25547233274552).

The spelling of 21404121134140 in words is "twenty-one trillion, four hundred four billion, one hundred twenty-one million, one hundred thirty-four thousand, one hundred forty".