20011221211012 has 6 divisors (see below), whose sum is σ = 35019637119278. Its totient is φ = 10005610605504.

The previous prime is 20011221210989. The next prime is 20011221211049. The reversal of 20011221211012 is 21011212211002.

It can be written as a sum of positive squares in only one way, i.e., 18229279219776 + 1781941991236 = 4269576^2 + 1334894^2 .

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 as a sum of consecutive naturals, namely, 2501402651373 + ... + 2501402651380.

Almost surely, 2^{20011221211012} is an apocalyptic number.

It is an amenable number.

20011221211012 is a deficient number, since it is larger than the sum of its proper divisors (15008415908266).

20011221211012 is a wasteful number, since it uses less digits than its factorization.

20011221211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002805302757 (or 5002805302755 counting only the distinct ones).

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

Adding to 20011221211012 its reverse (21011212211002), we get a palindrome (41022433422014).

The spelling of 20011221211012 in words is "twenty trillion, eleven billion, two hundred twenty-one million, two hundred eleven thousand, twelve".