21011220211012 has 12 divisors (see below), whose sum is σ = 36771753679360. Its totient is φ = 10505004874056.

The previous prime is 21011220210973. The next prime is 21011220211031. The reversal of 21011220211012 is 21011202211012.

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 in 3 ways as a sum of consecutive naturals, for example, 151229748 + ... + 151368619.

Almost surely, 2^{21011220211012} is an apocalyptic number.

It is an amenable number.

21011220211012 is a deficient number, since it is larger than the sum of its proper divisors (15760533468348).

21011220211012 is a wasteful number, since it uses less digits than its factorization.

21011220211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302615730 (or 302615728 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011220211012 its reverse (21011202211012), we get a palindrome (42022422422024).

The spelling of 21011220211012 in words is "twenty-one trillion, eleven billion, two hundred twenty million, two hundred eleven thousand, twelve".