21400885481 has 8 divisors (see below), whose sum is σ = 21563193120. Its totient is φ = 21239108352.

The previous prime is 21400885477. The next prime is 21400885487. The reversal of 21400885481 is 18458800412.

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

It is a cyclic number.

It is not a de Polignac number, because 21400885481 - 2² = 21400885477 is a prime.

It is a super-2 number, since 2×21400885481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400885487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51455 + ... + 213188.

It is an arithmetic number, because the mean of its divisors is an integer number (2695399140).

Almost surely, 2^21400885481 is an apocalyptic number.

It is an amenable number.

21400885481 is a deficient number, since it is larger than the sum of its proper divisors (162307639).

21400885481 is a wasteful number, since it uses less digits than its factorization.

21400885481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265255.

The product of its (nonzero) digits is 81920, while the sum is 41.

The spelling of 21400885481 in words is "twenty-one billion, four hundred million, eight hundred eighty-five thousand, four hundred eighty-one".