26921207240 has 64 divisors (see below), whose sum is σ = 62587330560. Its totient is φ = 10411004160.

The previous prime is 26921207237. The next prime is 26921207267. The reversal of 26921207240 is 4270212962.

It is a self number, because there is not a number n which added to its sum of digits gives 26921207240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1337894 + ... + 1357866.

It is an arithmetic number, because the mean of its divisors is an integer number (977927040).

Almost surely, 2^26921207240 is an apocalyptic number.

26921207240 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 26921207240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31293665280).

26921207240 is an abundant number, since it is smaller than the sum of its proper divisors (35666123320).

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

26921207240 is a wasteful number, since it uses less digits than its factorization.

26921207240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21102 (or 21098 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 26921207240 in words is "twenty-six billion, nine hundred twenty-one million, two hundred seven thousand, two hundred forty".