21013142244 has 24 divisors (see below), whose sum is σ = 49110667200. Its totient is φ = 6992951904.

The previous prime is 21013142239. The next prime is 21013142257. The reversal of 21013142244 is 44224131012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1420944 + ... + 1435655.

It is an arithmetic number, because the mean of its divisors is an integer number (2046277800).

Almost surely, 2^21013142244 is an apocalyptic number.

It is an amenable number.

21013142244 is an abundant number, since it is smaller than the sum of its proper divisors (28097524956).

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

21013142244 is a wasteful number, since it uses less digits than its factorization.

21013142244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857219 (or 2857217 counting only the distinct ones).

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

Adding to 21013142244 its reverse (44224131012), we get a palindrome (65237273256).

The spelling of 21013142244 in words is "twenty-one billion, thirteen million, one hundred forty-two thousand, two hundred forty-four".