20020111201201 has 4 divisors (see below), whose sum is σ = 20020126848804. Its totient is φ = 20020095553600.

The previous prime is 20020111201151. The next prime is 20020111201217. The reversal of 20020111201201 is 10210211102002.

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 5781865511601 + 14238245689600 = 2404551^2 + 3773360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020111201201 - 2⁷ = 20020111201073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20020111201001) 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, 5715220 + ... + 8526661.

It is an arithmetic number, because the mean of its divisors is an integer number (5005031712201).

Almost surely, 2^{20020111201201} is an apocalyptic number.

It is an amenable number.

20020111201201 is a deficient number, since it is larger than the sum of its proper divisors (15647603).

20020111201201 is a wasteful number, since it uses less digits than its factorization.

20020111201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15647602.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20020111201201 its reverse (10210211102002), we get a palindrome (30230322303203).

The spelling of 20020111201201 in words is "twenty trillion, twenty billion, one hundred eleven million, two hundred one thousand, two hundred one".