21320654105421 has 96 divisors (see below), whose sum is σ = 35955408528000. Its totient is φ = 12037070707200.

The previous prime is 21320654105389. The next prime is 21320654105537. The reversal of 21320654105421 is 12450145602312.

21320654105421 is a `hidden beast` number, since 2 + 13 + 2 + 0 + 65 + 41 + 0 + 542 + 1 = 666.

It is not a de Polignac number, because 21320654105421 - 2⁵ = 21320654105389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320694105421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 388829835 + ... + 388884663.

It is an arithmetic number, because the mean of its divisors is an integer number (374535505500).

Almost surely, 2^{21320654105421} is an apocalyptic number.

It is an amenable number.

21320654105421 is a deficient number, since it is larger than the sum of its proper divisors (14634754422579).

21320654105421 is a wasteful number, since it uses less digits than its factorization.

21320654105421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58315 (or 58312 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21320654105421 its reverse (12450145602312), we get a palindrome (33770799707733).

The spelling of 21320654105421 in words is "twenty-one trillion, three hundred twenty billion, six hundred fifty-four million, one hundred five thousand, four hundred twenty-one".