21554200012 has 12 divisors (see below), whose sum is σ = 37736402536. Its totient is φ = 10772370720.

The previous prime is 21554200009. The next prime is 21554200043. The reversal of 21554200012 is 21000245512.

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 3 ways as a sum of consecutive naturals, for example, 1172058 + ... + 1190305.

Almost surely, 2^21554200012 is an apocalyptic number.

It is an amenable number.

21554200012 is a deficient number, since it is larger than the sum of its proper divisors (16182202524).

21554200012 is a wasteful number, since it uses less digits than its factorization.

21554200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364648 (or 2364646 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21554200012 its reverse (21000245512), we get a palindrome (42554445524).

The spelling of 21554200012 in words is "twenty-one billion, five hundred fifty-four million, two hundred thousand, twelve".