20021201211101 has 16 divisors (see below), whose sum is σ = 20594479589424. Its totient is φ = 19455963830784.

The previous prime is 20021201211043. The next prime is 20021201211103. The reversal of 20021201211101 is 10111210212002.

It can be written as a sum of positive squares in 8 ways, for example, as 9007908100 + 20012193303001 = 94910^2 + 4473499^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021201211101 - 2¹⁴ = 20021201194717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021201211103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1239146 + ... + 6448091.

It is an arithmetic number, because the mean of its divisors is an integer number (1287154974339).

Almost surely, 2^{20021201211101} is an apocalyptic number.

It is an amenable number.

20021201211101 is a deficient number, since it is larger than the sum of its proper divisors (573278378323).

20021201211101 is a wasteful number, since it uses less digits than its factorization.

20021201211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7687760.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021201211101 its reverse (10111210212002), we get a palindrome (30132411423103).

Subtracting from 20021201211101 its reverse (10111210212002), we obtain a palindrome (9909990999099).

The spelling of 20021201211101 in words is "twenty trillion, twenty-one billion, two hundred one million, two hundred eleven thousand, one hundred one".