21221001130312 has 32 divisors (see below), whose sum is σ = 42152446552320. Its totient is φ = 9981015911680.

The previous prime is 21221001130243. The next prime is 21221001130337. The reversal of 21221001130312 is 21303110012212.

It is a self number, because there is not a number n which added to its sum of digits gives 21221001130312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41444308 + ... + 41953219.

It is an arithmetic number, because the mean of its divisors is an integer number (1317263954760).

Almost surely, 2^{21221001130312} is an apocalyptic number.

It is an amenable number.

21221001130312 is a deficient number, since it is larger than the sum of its proper divisors (20931445422008).

21221001130312 is a wasteful number, since it uses less digits than its factorization.

21221001130312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83399421 (or 83399417 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21221001130312 its reverse (21303110012212), we get a palindrome (42524111142524).

The spelling of 21221001130312 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred thirty thousand, three hundred twelve".