21554130000 has 400 divisors, whose sum is σ = 79364045376. Its totient is φ = 4992000000.

The previous prime is 21554129981. The next prime is 21554130041. The reversal of 21554130000 is 3145512.

It is a tau number, because it is divible by the number of its divisors (400).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6628375 + ... + 6631625.

Almost surely, 2^21554130000 is an apocalyptic number.

21554130000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21554130000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39682022688).

21554130000 is an abundant number, since it is smaller than the sum of its proper divisors (57809915376).

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

21554130000 is a wasteful number, since it uses less digits than its factorization.

21554130000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312 (or 3291 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21554130000 its reverse (3145512), we get a palindrome (21557275512).

The spelling of 21554130000 in words is "twenty-one billion, five hundred fifty-four million, one hundred thirty thousand".