21310028481 has 16 divisors (see below), whose sum is σ = 32793936768. Its totient is φ = 12056592000.

The previous prime is 21310028429. The next prime is 21310028483. The reversal of 21310028481 is 18482001312.

It is not a de Polignac number, because 21310028481 - 2²⁷ = 21175810753 is a prime.

It is a super-2 number, since 2×21310028481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21310028483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5021460 + ... + 5025701.

It is an arithmetic number, because the mean of its divisors is an integer number (2049621048).

Almost surely, 2^21310028481 is an apocalyptic number.

21310028481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21310028481 is a deficient number, since it is larger than the sum of its proper divisors (11483908287).

21310028481 is a wasteful number, since it uses less digits than its factorization.

21310028481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10047272.

The product of its (nonzero) digits is 3072, while the sum is 30.

Adding to 21310028481 its reverse (18482001312), we get a palindrome (39792029793).

The spelling of 21310028481 in words is "twenty-one billion, three hundred ten million, twenty-eight thousand, four hundred eighty-one".