21825877481 has 8 divisors (see below), whose sum is σ = 22033351680. Its totient is φ = 21618960048.

The previous prime is 21825877471. The next prime is 21825877483. The reversal of 21825877481 is 18477852812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21825877481 is a prime.

It is a super-2 number, since 2×21825877481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21825877483) 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 7 ways as a sum of consecutive naturals, for example, 60206 + ... + 217431.

It is an arithmetic number, because the mean of its divisors is an integer number (2754168960).

Almost surely, 2^21825877481 is an apocalyptic number.

It is an amenable number.

21825877481 is a deficient number, since it is larger than the sum of its proper divisors (207474199).

21825877481 is a wasteful number, since it uses less digits than its factorization.

21825877481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278383.

The product of its digits is 2007040, while the sum is 53.

The spelling of 21825877481 in words is "twenty-one billion, eight hundred twenty-five million, eight hundred seventy-seven thousand, four hundred eighty-one".