20111020021201 has 4 divisors (see below), whose sum is σ = 20118928407552. Its totient is φ = 20103111634852.

The previous prime is 20111020021181. The next prime is 20111020021271. The reversal of 20111020021201 is 10212002011102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111020021201 - 2⁷ = 20111020021073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111020021271) 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, 3954189361 + ... + 3954194446.

It is an arithmetic number, because the mean of its divisors is an integer number (5029732101888).

Almost surely, 2^{20111020021201} is an apocalyptic number.

It is an amenable number.

20111020021201 is a deficient number, since it is larger than the sum of its proper divisors (7908386351).

20111020021201 is an equidigital number, since it uses as much as digits as its factorization.

20111020021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908386350.

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

Adding to 20111020021201 its reverse (10212002011102), we get a palindrome (30323022032303).

The spelling of 20111020021201 in words is "twenty trillion, one hundred eleven billion, twenty million, twenty-one thousand, two hundred one".