26401650021 has 12 divisors (see below), whose sum is σ = 39793791648. Its totient is φ = 16835834664.

The previous prime is 26401650007. The next prime is 26401650049. The reversal of 26401650021 is 12005610462.

26401650021 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 1 + 650 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 26401650021 - 2⁹ = 26401649509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401652021) 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 11 ways as a sum of consecutive naturals, for example, 63771895 + ... + 63772308.

It is an arithmetic number, because the mean of its divisors is an integer number (3316149304).

Almost surely, 2^26401650021 is an apocalyptic number.

It is an amenable number.

26401650021 is a deficient number, since it is larger than the sum of its proper divisors (13392141627).

26401650021 is a wasteful number, since it uses less digits than its factorization.

26401650021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127544232 (or 127544229 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 26401650021 in words is "twenty-six billion, four hundred one million, six hundred fifty thousand, twenty-one".