21444072456170 has 64 divisors (see below), whose sum is σ = 50007229735680. Its totient is φ = 6429500955648.

The previous prime is 21444072456061. The next prime is 21444072456173. The reversal of 21444072456170 is 7165427044412.

It is not an unprimeable number, because it can be changed into a prime (21444072456173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 620112047 + ... + 620146626.

It is an arithmetic number, because the mean of its divisors is an integer number (781362964620).

Almost surely, 2^{21444072456170} is an apocalyptic number.

21444072456170 is an abundant number, since it is smaller than the sum of its proper divisors (28563157279510).

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

21444072456170 is a wasteful number, since it uses less digits than its factorization.

21444072456170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240258719.

The product of its (nonzero) digits is 1505280, while the sum is 47.

The spelling of 21444072456170 in words is "twenty-one trillion, four hundred forty-four billion, seventy-two million, four hundred fifty-six thousand, one hundred seventy".