21446989473 has 32 divisors (see below), whose sum is σ = 35379412992. Its totient is φ = 11253441600.

The previous prime is 21446989463. The next prime is 21446989481. The reversal of 21446989473 is 37498964412.

It is not a de Polignac number, because 21446989473 - 2⁶ = 21446989409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21446989453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153513 + ... + 257798.

It is an arithmetic number, because the mean of its divisors is an integer number (1105606656).

Almost surely, 2^21446989473 is an apocalyptic number.

It is an amenable number.

21446989473 is a deficient number, since it is larger than the sum of its proper divisors (13932423519).

21446989473 is a wasteful number, since it uses less digits than its factorization.

21446989473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411525.

The product of its digits is 10450944, while the sum is 57.

The spelling of 21446989473 in words is "twenty-one billion, four hundred forty-six million, nine hundred eighty-nine thousand, four hundred seventy-three".