21455082628 has 24 divisors (see below), whose sum is σ = 45434293632. Its totient is φ = 8654150784.

The previous prime is 21455082563. The next prime is 21455082629. The reversal of 21455082628 is 82628055412.

It is not an unprimeable number, because it can be changed into a prime (21455082629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22536376 + ... + 22537327.

It is an arithmetic number, because the mean of its divisors is an integer number (1893095568).

Almost surely, 2^21455082628 is an apocalyptic number.

21455082628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21455082628 is an abundant number, since it is smaller than the sum of its proper divisors (23979211004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21455082628 is a wasteful number, since it uses less digits than its factorization.

21455082628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45073731 (or 45073729 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 43.

The spelling of 21455082628 in words is "twenty-one billion, four hundred fifty-five million, eighty-two thousand, six hundred twenty-eight".