21423144300 has 144 divisors (see below), whose sum is σ = 63831560352. Its totient is φ = 5543424000.

The previous prime is 21423144283. The next prime is 21423144313. The reversal of 21423144300 is 344132412.

It is a super-2 number, since 2×21423144300² (a number of 21 digits) contains 22 as substring.

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, 4448694 + ... + 4453506.

Almost surely, 2^21423144300 is an apocalyptic number.

21423144300 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 21423144300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31915780176).

21423144300 is an abundant number, since it is smaller than the sum of its proper divisors (42408416052).

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

21423144300 is a wasteful number, since it uses less digits than its factorization.

21423144300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268 (or 5261 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21423144300 its reverse (344132412), we get a palindrome (21767276712).

The spelling of 21423144300 in words is "twenty-one billion, four hundred twenty-three million, one hundred forty-four thousand, three hundred".