16444520021420 has 12 divisors (see below), whose sum is σ = 34533492045024. Its totient is φ = 6577808008560.

The previous prime is 16444520021407. The next prime is 16444520021429. The reversal of 16444520021420 is 2412002544461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16444520021429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411113000516 + ... + 411113000555.

It is an arithmetic number, because the mean of its divisors is an integer number (2877791003752).

Almost surely, 2^{16444520021420} is an apocalyptic number.

16444520021420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16444520021420 is an abundant number, since it is smaller than the sum of its proper divisors (18088972023604).

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

16444520021420 is a wasteful number, since it uses less digits than its factorization.

16444520021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822226001080 (or 822226001078 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

Adding to 16444520021420 its reverse (2412002544461), we get a palindrome (18856522565881).

The spelling of 16444520021420 in words is "sixteen trillion, four hundred forty-four billion, five hundred twenty million, twenty-one thousand, four hundred twenty".