21382170479428 has 96 divisors (see below), whose sum is σ = 44424648253440. Its totient is φ = 8893250703360.

The previous prime is 21382170479399. The next prime is 21382170479429. The reversal of 21382170479428 is 82497407128312.

It is a happy number.

It is a super-2 number, since 2×21382170479428² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21382170479429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35095576 + ... + 35699632.

It is an arithmetic number, because the mean of its divisors is an integer number (462756752640).

Almost surely, 2^{21382170479428} is an apocalyptic number.

It is an amenable number.

21382170479428 is an abundant number, since it is smaller than the sum of its proper divisors (23042477774012).

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

21382170479428 is a wasteful number, since it uses less digits than its factorization.

21382170479428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605405 (or 605403 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 58.

The spelling of 21382170479428 in words is "twenty-one trillion, three hundred eighty-two billion, one hundred seventy million, four hundred seventy-nine thousand, four hundred twenty-eight".