21928541481 has 64 divisors (see below), whose sum is σ = 42264023040. Its totient is φ = 10896145920.

The previous prime is 21928541447. The next prime is 21928541501. The reversal of 21928541481 is 18414582912.

21928541481 is a `hidden beast` number, since 2 + 1 + 9 + 28 + 541 + 4 + 81 = 666.

It is not a de Polignac number, because 21928541481 - 2⁹ = 21928540969 is a prime.

It is a super-2 number, since 2×21928541481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21928541581) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 181480 + ... + 277113.

It is an arithmetic number, because the mean of its divisors is an integer number (660375360).

Almost surely, 2^21928541481 is an apocalyptic number.

21928541481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21928541481 is a deficient number, since it is larger than the sum of its proper divisors (20335481559).

21928541481 is a wasteful number, since it uses less digits than its factorization.

21928541481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458643 (or 458637 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 21928541481 in words is "twenty-one billion, nine hundred twenty-eight million, five hundred forty-one thousand, four hundred eighty-one".