21542513223000 has 1024 divisors, whose sum is σ = 85950678528000. Its totient is φ = 4453182720000.

The previous prime is 21542513222981. The next prime is 21542513223041. The reversal of 21542513223000 is 32231524512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2229838170 + ... + 2229847830.

It is an arithmetic number, because the mean of its divisors is an integer number (83936209500).

Almost surely, 2^{21542513223000} is an apocalyptic number.

21542513223000 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 21542513223000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42975339264000).

21542513223000 is an abundant number, since it is smaller than the sum of its proper divisors (64408165305000).

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

21542513223000 is a wasteful number, since it uses less digits than its factorization.

21542513223000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9914 (or 9886 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21542513223000 its reverse (32231524512), we get a palindrome (21574744747512).

The spelling of 21542513223000 in words is "twenty-one trillion, five hundred forty-two billion, five hundred thirteen million, two hundred twenty-three thousand".