20011211021201 has 4 divisors (see below), whose sum is σ = 20030582959332. Its totient is φ = 19991839083072.

The previous prime is 20011211021161. The next prime is 20011211021251. The reversal of 20011211021201 is 10212011211002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17999238987601 + 2011972033600 = 4242551^2 + 1418440^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011211021201 - 2³⁸ = 19736333114257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011211021251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9685967516 + ... + 9685969581.

It is an arithmetic number, because the mean of its divisors is an integer number (5007645739833).

Almost surely, 2^{20011211021201} is an apocalyptic number.

It is an amenable number.

20011211021201 is a deficient number, since it is larger than the sum of its proper divisors (19371938131).

20011211021201 is a wasteful number, since it uses less digits than its factorization.

20011211021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19371938130.

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

Adding to 20011211021201 its reverse (10212011211002), we get a palindrome (30223222232203).

The spelling of 20011211021201 in words is "twenty trillion, eleven billion, two hundred eleven million, twenty-one thousand, two hundred one".