21553034200000 has 336 divisors, whose sum is σ = 53986625884800. Its totient is φ = 8536348800000.

The previous prime is 21553034199979. The next prime is 21553034200021. The reversal of 21553034200000 is 243035512.

It is an interprime number because it is at equal distance from previous prime (21553034199979) and next prime (21553034200021).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13649799211 + ... + 13649800789.

It is an arithmetic number, because the mean of its divisors is an integer number (160674481800).

Almost surely, 2^{21553034200000} is an apocalyptic number.

21553034200000 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 21553034200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26993312942400).

21553034200000 is an abundant number, since it is smaller than the sum of its proper divisors (32433591684800).

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

21553034200000 is an equidigital number, since it uses as much as digits as its factorization.

21553034200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246 (or 2216 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21553034200000 its reverse (243035512), we get a palindrome (21553277235512).

The spelling of 21553034200000 in words is "twenty-one trillion, five hundred fifty-three billion, thirty-four million, two hundred thousand".