21000554300000 has 432 divisors, whose sum is σ = 56896314496560. Its totient is φ = 7624003200000.

The previous prime is 21000554299981. The next prime is 21000554300023. The reversal of 21000554300000 is 345500012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10611699011 + ... + 10611700989.

It is an arithmetic number, because the mean of its divisors is an integer number (131704431705).

Almost surely, 2^{21000554300000} is an apocalyptic number.

21000554300000 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 21000554300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28448157248280).

21000554300000 is an abundant number, since it is smaller than the sum of its proper divisors (35895760196560).

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

21000554300000 is an equidigital number, since it uses as much as digits as its factorization.

21000554300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913 (or 2874 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Adding to 21000554300000 its reverse (345500012), we get a palindrome (21000899800012).

The spelling of 21000554300000 in words is "twenty-one trillion, five hundred fifty-four million, three hundred thousand".