21452644026 has 48 divisors (see below), whose sum is σ = 50717878848. Its totient is φ = 6499310400.

The previous prime is 21452644021. The next prime is 21452644027. The reversal of 21452644026 is 62044625412.

21452644026 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 2 + 644 + 0 + 2 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21452644021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1107315 + ... + 1126521.

It is an arithmetic number, because the mean of its divisors is an integer number (1056622476).

Almost surely, 2^21452644026 is an apocalyptic number.

21452644026 is an abundant number, since it is smaller than the sum of its proper divisors (29265234822).

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

21452644026 is a wasteful number, since it uses less digits than its factorization.

21452644026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24867 (or 24864 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 21452644026 in words is "twenty-one billion, four hundred fifty-two million, six hundred forty-four thousand, twenty-six".