21311321002 has 16 divisors (see below), whose sum is σ = 34507088640. Its totient is φ = 9840909232.

The previous prime is 21311320963. The next prime is 21311321011. The reversal of 21311321002 is 20012311312.

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, 7986418 + ... + 7989085.

It is an arithmetic number, because the mean of its divisors is an integer number (2156693040).

Almost surely, 2^21311321002 is an apocalyptic number.

21311321002 is a deficient number, since it is larger than the sum of its proper divisors (13195767638).

21311321002 is a wasteful number, since it uses less digits than its factorization.

21311321002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15975557.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21311321002 its reverse (20012311312), we get a palindrome (41323632314).

The spelling of 21311321002 in words is "twenty-one billion, three hundred eleven million, three hundred twenty-one thousand, two".