21144234000 has 160 divisors (see below), whose sum is σ = 68257702656. Its totient is φ = 5631129600.

The previous prime is 21144233969. The next prime is 21144234019. The reversal of 21144234000 is 43244112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5860197 + ... + 5863803.

Almost surely, 2^21144234000 is an apocalyptic number.

21144234000 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 21144234000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34128851328).

21144234000 is an abundant number, since it is smaller than the sum of its proper divisors (47113468656).

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

21144234000 is a wasteful number, since it uses less digits than its factorization.

21144234000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610 (or 4594 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21144234000 its reverse (43244112), we get a palindrome (21187478112).

The spelling of 21144234000 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand".