26781046821 has 32 divisors (see below), whose sum is σ = 39914150400. Its totient is φ = 17747009280.

The previous prime is 26781046819. The next prime is 26781046837. The reversal of 26781046821 is 12864018762.

It is not a de Polignac number, because 26781046821 - 2¹ = 26781046819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26781046811) 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, 3339865 + ... + 3347873.

It is an arithmetic number, because the mean of its divisors is an integer number (1247317200).

Almost surely, 2^26781046821 is an apocalyptic number.

It is an amenable number.

26781046821 is a deficient number, since it is larger than the sum of its proper divisors (13133103579).

26781046821 is a wasteful number, since it uses less digits than its factorization.

26781046821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8746 (or 8740 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 26781046821 in words is "twenty-six billion, seven hundred eighty-one million, forty-six thousand, eight hundred twenty-one".