26498640021 has 16 divisors (see below), whose sum is σ = 40539760128. Its totient is φ = 15081750000.

The previous prime is 26498639971. The next prime is 26498640023. The reversal of 26498640021 is 12004689462.

It is not a de Polignac number, because 26498640021 - 2⁹ = 26498639509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26498640023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2508355 + ... + 2518896.

It is an arithmetic number, because the mean of its divisors is an integer number (2533735008).

Almost surely, 2^26498640021 is an apocalyptic number.

26498640021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26498640021 is a deficient number, since it is larger than the sum of its proper divisors (14041120107).

26498640021 is a wasteful number, since it uses less digits than its factorization.

26498640021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5027512.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 26498640021 in words is "twenty-six billion, four hundred ninety-eight million, six hundred forty thousand, twenty-one".