21554529084 has 144 divisors (see below), whose sum is σ = 62585097120. Its totient is φ = 6408230400.

The previous prime is 21554529083. The next prime is 21554529127. The reversal of 21554529084 is 48092545512.

21554529084 is a `hidden beast` number, since 2 + 1 + 5 + 545 + 29 + 0 + 84 = 666.

It is a super-4 number, since 4×21554529084⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554529083) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 677044 + ... + 708164.

It is an arithmetic number, because the mean of its divisors is an integer number (434618730).

Almost surely, 2^21554529084 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21554529084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31292548560).

21554529084 is an abundant number, since it is smaller than the sum of its proper divisors (41030568036).

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

21554529084 is a wasteful number, since it uses less digits than its factorization.

21554529084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31209 (or 31190 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 21554529084 in words is "twenty-one billion, five hundred fifty-four million, five hundred twenty-nine thousand, eighty-four".