21554410432 has 28 divisors (see below), whose sum is σ = 45288037440. Its totient is φ = 10143251456.

The previous prime is 21554410393. The next prime is 21554410511. The reversal of 21554410432 is 23401445512.

It is a super-2 number, since 2×21554410432² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21554410394 and 21554410403.

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, 9904432 + ... + 9906607.

Almost surely, 2^21554410432 is an apocalyptic number.

It is an amenable number.

21554410432 is an abundant number, since it is smaller than the sum of its proper divisors (23733627008).

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

21554410432 is a wasteful number, since it uses less digits than its factorization.

21554410432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19811068 (or 19811058 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21554410432 its reverse (23401445512), we get a palindrome (44955855944).

The spelling of 21554410432 in words is "twenty-one billion, five hundred fifty-four million, four hundred ten thousand, four hundred thirty-two".