21231311231330 has 16 divisors (see below), whose sum is σ = 38429859438720. Its totient is φ = 8445080220912.

The previous prime is 21231311231329. The next prime is 21231311231359. The reversal of 21231311231330 is 3313211313212.

It is a self number, because there is not a number n which added to its sum of digits gives 21231311231330.

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, 5930532074 + ... + 5930535653.

It is an arithmetic number, because the mean of its divisors is an integer number (2401866214920).

Almost surely, 2^{21231311231330} is an apocalyptic number.

21231311231330 is a deficient number, since it is larger than the sum of its proper divisors (17198548207390).

21231311231330 is a wasteful number, since it uses less digits than its factorization.

21231311231330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11861067913.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21231311231330 its reverse (3313211313212), we get a palindrome (24544522544542).

The spelling of 21231311231330 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred eleven million, two hundred thirty-one thousand, three hundred thirty".