21426054556 has 12 divisors (see below), whose sum is σ = 38110277800. Its totient is φ = 10537403760.

The previous prime is 21426054527. The next prime is 21426054563. The reversal of 21426054556 is 65545062412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43905606 + ... + 43906093.

Almost surely, 2^21426054556 is an apocalyptic number.

It is an amenable number.

21426054556 is a deficient number, since it is larger than the sum of its proper divisors (16684223244).

21426054556 is a wasteful number, since it uses less digits than its factorization.

21426054556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87811764 (or 87811762 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 21426054556 in words is "twenty-one billion, four hundred twenty-six million, fifty-four thousand, five hundred fifty-six".