20211021200101 has 4 divisors (see below), whose sum is σ = 20211072205600. Its totient is φ = 20210970194604.

The previous prime is 20211021200089. The next prime is 20211021200129. The reversal of 20211021200101 is 10100212011202.

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 20211021200101 - 2¹³ = 20211021191909 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 (20211021200191) 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, 24903681 + ... + 25702438.

It is an arithmetic number, because the mean of its divisors is an integer number (5052768051400).

Almost surely, 2^{20211021200101} is an apocalyptic number.

It is an amenable number.

20211021200101 is a deficient number, since it is larger than the sum of its proper divisors (51005499).

20211021200101 is an equidigital number, since it uses as much as digits as its factorization.

20211021200101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51005498.

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

Adding to 20211021200101 its reverse (10100212011202), we get a palindrome (30311233211303).

The spelling of 20211021200101 in words is "twenty trillion, two hundred eleven billion, twenty-one million, two hundred thousand, one hundred one".