26721121540 has 24 divisors (see below), whose sum is σ = 56124754560. Its totient is φ = 10686467808.

The previous prime is 26721121517. The next prime is 26721121549. The reversal of 26721121540 is 4512112762.

It is not an unprimeable number, because it can be changed into a prime (26721121549) 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, 10662 + ... + 231421.

It is an arithmetic number, because the mean of its divisors is an integer number (2338531440).

Almost surely, 2^26721121540 is an apocalyptic number.

26721121540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26721121540 is an abundant number, since it is smaller than the sum of its proper divisors (29403633020).

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

26721121540 is a wasteful number, since it uses less digits than its factorization.

26721121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247611 (or 247609 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 26721121540 in words is "twenty-six billion, seven hundred twenty-one million, one hundred twenty-one thousand, five hundred forty".