21230144621400 has 768 divisors, whose sum is σ = 79275701030400. Its totient is φ = 4630800384000.

The previous prime is 21230144621377. The next prime is 21230144621443. The reversal of 21230144621400 is 412644103212.

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 191 ways as a sum of consecutive naturals, for example, 5617924711 + ... + 5617928489.

It is an arithmetic number, because the mean of its divisors is an integer number (103223569050).

Almost surely, 2^{21230144621400} is an apocalyptic number.

21230144621400 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 21230144621400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39637850515200).

21230144621400 is an abundant number, since it is smaller than the sum of its proper divisors (58045556409000).

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

21230144621400 is a wasteful number, since it uses less digits than its factorization.

21230144621400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21230144621400 its reverse (412644103212), we get a palindrome (21642788724612).

The spelling of 21230144621400 in words is "twenty-one trillion, two hundred thirty billion, one hundred forty-four million, six hundred twenty-one thousand, four hundred".