20201021101 has 4 divisors (see below), whose sum is σ = 20202048832. Its totient is φ = 20199993372.

The previous prime is 20201021077. The next prime is 20201021111. The reversal of 20201021101 is 10112010202.

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 a de Polignac number, because none of the positive numbers 2^k-20201021101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201021111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483795 + ... + 523888.

It is an arithmetic number, because the mean of its divisors is an integer number (5050512208).

Almost surely, 2^20201021101 is an apocalyptic number.

It is an amenable number.

20201021101 is a deficient number, since it is larger than the sum of its proper divisors (1027731).

20201021101 is a wasteful number, since it uses less digits than its factorization.

20201021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027730.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20201021101 its reverse (10112010202), we get a palindrome (30313031303).

The spelling of 20201021101 in words is "twenty billion, two hundred one million, twenty-one thousand, one hundred one".