21894873474719 has 12 divisors (see below), whose sum is σ = 26581220592624. Its totient is φ = 17663091204864.

The previous prime is 21894873474703. The next prime is 21894873474731. The reversal of 21894873474719 is 91747437849812.

It is not a de Polignac number, because 21894873474719 - 2⁴ = 21894873474703 is a prime.

It is a super-2 number, since 2×21894873474719² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894873474119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5411484254 + ... + 5411488299.

It is an arithmetic number, because the mean of its divisors is an integer number (2215101716052).

Almost surely, 2^{21894873474719} is an apocalyptic number.

21894873474719 is a deficient number, since it is larger than the sum of its proper divisors (4686347117905).

21894873474719 is a wasteful number, since it uses less digits than its factorization.

21894873474719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10822972594 (or 10822972577 counting only the distinct ones).

The product of its digits is 682795008, while the sum is 74.

The spelling of 21894873474719 in words is "twenty-one trillion, eight hundred ninety-four billion, eight hundred seventy-three million, four hundred seventy-four thousand, seven hundred nineteen".