21825872973 has 6 divisors (see below), whose sum is σ = 31526260974. Its totient is φ = 14550581976.

The previous prime is 21825872951. The next prime is 21825873001. The reversal of 21825872973 is 37927852812.

It can be written as a sum of positive squares in only one way, i.e., 15346749924 + 6479123049 = 123882^2 + 80493^2 .

It is not a de Polignac number, because 21825872973 - 2²⁹ = 21289002061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825872933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1212548490 + ... + 1212548507.

It is an arithmetic number, because the mean of its divisors is an integer number (5254376829).

Almost surely, 2^21825872973 is an apocalyptic number.

It is an amenable number.

21825872973 is a deficient number, since it is larger than the sum of its proper divisors (9700388001).

21825872973 is a wasteful number, since it uses less digits than its factorization.

21825872973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425097003 (or 2425097000 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 21825872973 in words is "twenty-one billion, eight hundred twenty-five million, eight hundred seventy-two thousand, nine hundred seventy-three".