21002122212112 has 10 divisors (see below), whose sum is σ = 40691611785998. Its totient is φ = 10501061106048.

The previous prime is 21002122212109. The next prime is 21002122212173. The reversal of 21002122212112 is 21121222120012.

It can be written as a sum of positive squares in only one way, i.e., 20740956242176 + 261165969936 = 4554224^2 + 511044^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21002122212112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656316319113 + ... + 656316319144.

Almost surely, 2^{21002122212112} is an apocalyptic number.

It is an amenable number.

21002122212112 is a deficient number, since it is larger than the sum of its proper divisors (19689489573886).

21002122212112 is a wasteful number, since it uses less digits than its factorization.

21002122212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312632638265 (or 1312632638259 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21002122212112 its reverse (21121222120012), we get a palindrome (42123344332124).

The spelling of 21002122212112 in words is "twenty-one trillion, two billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twelve".