21440331012 has 24 divisors (see below), whose sum is σ = 50032684800. Its totient is φ = 7146027616.

The previous prime is 21440331001. The next prime is 21440331013. The reversal of 21440331012 is 21013304412.

It is a self number, because there is not a number n which added to its sum of digits gives 21440331012.

It is not an unprimeable number, because it can be changed into a prime (21440331013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32314 + ... + 209582.

It is an arithmetic number, because the mean of its divisors is an integer number (2084695200).

Almost surely, 2^21440331012 is an apocalyptic number.

It is an amenable number.

21440331012 is an abundant number, since it is smaller than the sum of its proper divisors (28592353788).

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

21440331012 is a wasteful number, since it uses less digits than its factorization.

21440331012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187355 (or 187353 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21440331012 its reverse (21013304412), we get a palindrome (42453635424).

The spelling of 21440331012 in words is "twenty-one billion, four hundred forty million, three hundred thirty-one thousand, twelve".