21442521436 has 24 divisors (see below), whose sum is σ = 43100556800. Its totient is φ = 9143470512.

The previous prime is 21442521367. The next prime is 21442521449. The reversal of 21442521436 is 63412524412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1918560 + ... + 1929703.

Almost surely, 2^21442521436 is an apocalyptic number.

It is an amenable number.

21442521436 is an abundant number, since it is smaller than the sum of its proper divisors (21658035364).

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

21442521436 is a wasteful number, since it uses less digits than its factorization.

21442521436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848473 (or 3848471 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The spelling of 21442521436 in words is "twenty-one billion, four hundred forty-two million, five hundred twenty-one thousand, four hundred thirty-six".