26421253540 has 96 divisors (see below), whose sum is σ = 61740395136. Its totient is φ = 9417047040.

The previous prime is 26421253517. The next prime is 26421253541. The reversal of 26421253540 is 4535212462.

It is a junction number, because it is equal to n+sod(n) for n = 26421253496 and 26421253505.

It is not an unprimeable number, because it can be changed into a prime (26421253541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2612734 + ... + 2622826.

It is an arithmetic number, because the mean of its divisors is an integer number (643129116).

Almost surely, 2^26421253540 is an apocalyptic number.

26421253540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26421253540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30870197568).

26421253540 is an abundant number, since it is smaller than the sum of its proper divisors (35319141596).

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

26421253540 is a wasteful number, since it uses less digits than its factorization.

26421253540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10349 (or 10347 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 26421253540 in words is "twenty-six billion, four hundred twenty-one million, two hundred fifty-three thousand, five hundred forty".