21143223244 has 96 divisors (see below), whose sum is σ = 44650932480. Its totient is φ = 8633184000.

The previous prime is 21143223217. The next prime is 21143223253. The reversal of 21143223244 is 44232234112.

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, 3405447 + ... + 3411649.

It is an arithmetic number, because the mean of its divisors is an integer number (465113880).

Almost surely, 2^21143223244 is an apocalyptic number.

It is an amenable number.

21143223244 is an abundant number, since it is smaller than the sum of its proper divisors (23507709236).

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

21143223244 is a wasteful number, since it uses less digits than its factorization.

21143223244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6391 (or 6389 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 21143223244 its reverse (44232234112), we get a palindrome (65375457356).

The spelling of 21143223244 in words is "twenty-one billion, one hundred forty-three million, two hundred twenty-three thousand, two hundred forty-four".