21282620408 has 32 divisors (see below), whose sum is σ = 46536348000. Its totient is φ = 9121121856.

The previous prime is 21282620389. The next prime is 21282620431. The reversal of 21282620408 is 80402628212.

It is a congruent number.

It is an unprimeable number.

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, 3875285 + ... + 3880772.

It is an arithmetic number, because the mean of its divisors is an integer number (1454260875).

Almost surely, 2^21282620408 is an apocalyptic number.

21282620408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21282620408 is an abundant number, since it is smaller than the sum of its proper divisors (25253727592).

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

21282620408 is an equidigital number, since it uses as much as digits as its factorization.

21282620408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756084 (or 7756066 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The spelling of 21282620408 in words is "twenty-one billion, two hundred eighty-two million, six hundred twenty thousand, four hundred eight".