21485873061 has 24 divisors (see below), whose sum is σ = 31258655064. Its totient is φ = 14221025280.

The previous prime is 21485873051. The next prime is 21485873063. The reversal of 21485873061 is 16037858412.

21485873061 is a `hidden beast` number, since 2 + 1 + 4 + 8 + 587 + 3 + 0 + 61 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5237272161 + 16248600900 = 72369^2 + 127470^2 .

It is not a de Polignac number, because 21485873061 - 2¹¹ = 21485871013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21485872998 and 21485873016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485873063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 994405 + ... + 1015781.

It is an arithmetic number, because the mean of its divisors is an integer number (1302443961).

Almost surely, 2^21485873061 is an apocalyptic number.

It is an amenable number.

21485873061 is a deficient number, since it is larger than the sum of its proper divisors (9772782003).

21485873061 is a wasteful number, since it uses less digits than its factorization.

21485873061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22181 (or 22178 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 21485873061 in words is "twenty-one billion, four hundred eighty-five million, eight hundred seventy-three thousand, sixty-one".