26821510420 has 12 divisors (see below), whose sum is σ = 56325171924. Its totient is φ = 10728604160.

The previous prime is 26821510411. The next prime is 26821510433. The reversal of 26821510420 is 2401512862.

It can be written as a sum of positive squares in 2 ways, for example, as 7676913924 + 19144596496 = 87618^2 + 138364^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670537741 + ... + 670537780.

It is an arithmetic number, because the mean of its divisors is an integer number (4693764327).

Almost surely, 2^26821510420 is an apocalyptic number.

26821510420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26821510420 is an abundant number, since it is smaller than the sum of its proper divisors (29503661504).

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

26821510420 is a wasteful number, since it uses less digits than its factorization.

26821510420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341075530 (or 1341075528 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The spelling of 26821510420 in words is "twenty-six billion, eight hundred twenty-one million, five hundred ten thousand, four hundred twenty".