20201111011021 has 4 divisors (see below), whose sum is σ = 20852759753344. Its totient is φ = 19549462268700.

The previous prime is 20201111010929. The next prime is 20201111011049. The reversal of 20201111011021 is 12011011110202.

It is a happy number.

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 20201111011021 - 2¹³ = 20201111002829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201111010992 and 20201111011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201111011421) 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, 325824371115 + ... + 325824371176.

It is an arithmetic number, because the mean of its divisors is an integer number (5213189938336).

Almost surely, 2^{20201111011021} is an apocalyptic number.

It is an amenable number.

20201111011021 is a deficient number, since it is larger than the sum of its proper divisors (651648742323).

20201111011021 is an equidigital number, since it uses as much as digits as its factorization.

20201111011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651648742322.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20201111011021 its reverse (12011011110202), we get a palindrome (32212122121223).

The spelling of 20201111011021 in words is "twenty trillion, two hundred one billion, one hundred eleven million, eleven thousand, twenty-one".