20011210012221 has 32 divisors (see below), whose sum is σ = 28549532712960. Its totient is φ = 12436968931200.

The previous prime is 20011210012193. The next prime is 20011210012253. The reversal of 20011210012221 is 12221001211002.

It is not a de Polignac number, because 20011210012221 - 2¹⁷ = 20011209881149 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20011210012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011210010221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 765381 + ... + 6372458.

It is an arithmetic number, because the mean of its divisors is an integer number (892172897280).

Almost surely, 2^{20011210012221} is an apocalyptic number.

It is an amenable number.

20011210012221 is a deficient number, since it is larger than the sum of its proper divisors (8538322700739).

20011210012221 is a wasteful number, since it uses less digits than its factorization.

20011210012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138897.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20011210012221 its reverse (12221001211002), we get a palindrome (32232211223223).

The spelling of 20011210012221 in words is "twenty trillion, eleven billion, two hundred ten million, twelve thousand, two hundred twenty-one".