21863664621804 has 48 divisors (see below), whose sum is σ = 51383357020800. Its totient is φ = 7235299134336.

The previous prime is 21863664621797. The next prime is 21863664621809. The reversal of 21863664621804 is 40812646636812.

21863664621804 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21863664621809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95139712 + ... + 95369240.

It is an arithmetic number, because the mean of its divisors is an integer number (1070486604600).

Almost surely, 2^{21863664621804} is an apocalyptic number.

It is an amenable number.

21863664621804 is an abundant number, since it is smaller than the sum of its proper divisors (29519692398996).

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

21863664621804 is a wasteful number, since it uses less digits than its factorization.

21863664621804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286782 (or 286780 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 57.

The spelling of 21863664621804 in words is "twenty-one trillion, eight hundred sixty-three billion, six hundred sixty-four million, six hundred twenty-one thousand, eight hundred four".