26891098521 has 48 divisors (see below), whose sum is σ = 43216104960. Its totient is φ = 14814696960.

The previous prime is 26891098519. The next prime is 26891098543. The reversal of 26891098521 is 12589019862.

It is not a de Polignac number, because 26891098521 - 2¹ = 26891098519 is a prime.

It is a super-2 number, since 2×26891098521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26891098571) 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 47 ways as a sum of consecutive naturals, for example, 1214865 + ... + 1236801.

It is an arithmetic number, because the mean of its divisors is an integer number (900335520).

Almost surely, 2^26891098521 is an apocalyptic number.

26891098521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26891098521 is a deficient number, since it is larger than the sum of its proper divisors (16325006439).

26891098521 is a wasteful number, since it uses less digits than its factorization.

26891098521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22254 (or 22247 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 26891098521 in words is "twenty-six billion, eight hundred ninety-one million, ninety-eight thousand, five hundred twenty-one".