21554022412 has 12 divisors (see below), whose sum is σ = 40621042336. Its totient is φ = 9948010320.

The previous prime is 21554022377. The next prime is 21554022421. The reversal of 21554022412 is 21422045512.

It is a happy number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207250164 + ... + 207250267.

Almost surely, 2^21554022412 is an apocalyptic number.

It is an amenable number.

21554022412 is a deficient number, since it is larger than the sum of its proper divisors (19067019924).

21554022412 is a wasteful number, since it uses less digits than its factorization.

21554022412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414500448 (or 414500446 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 21554022412 its reverse (21422045512), we get a palindrome (42976067924).

The spelling of 21554022412 in words is "twenty-one billion, five hundred fifty-four million, twenty-two thousand, four hundred twelve".