21143210244 has 48 divisors (see below), whose sum is σ = 54000085440. Its totient is φ = 6398951040.

The previous prime is 21143210227. The next prime is 21143210269. The reversal of 21143210244 is 44201234112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101414 + ... + 1120445.

It is an arithmetic number, because the mean of its divisors is an integer number (1125001780).

Almost surely, 2^21143210244 is an apocalyptic number.

It is an amenable number.

21143210244 is an abundant number, since it is smaller than the sum of its proper divisors (32856875196).

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

21143210244 is a wasteful number, since it uses less digits than its factorization.

21143210244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221940 (or 2221938 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21143210244 its reverse (44201234112), we get a palindrome (65344444356).

The spelling of 21143210244 in words is "twenty-one billion, one hundred forty-three million, two hundred ten thousand, two hundred forty-four".