21020211101 has 4 divisors (see below), whose sum is σ = 21088681152. Its totient is φ = 20951741052.

The previous prime is 21020211077. The next prime is 21020211131. The reversal of 21020211101 is 10111202012.

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 21020211101 - 2¹⁰ = 21020210077 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 (21020211131) 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, 34234565 + ... + 34235178.

It is an arithmetic number, because the mean of its divisors is an integer number (5272170288).

Almost surely, 2^21020211101 is an apocalyptic number.

It is an amenable number.

21020211101 is a deficient number, since it is larger than the sum of its proper divisors (68470051).

21020211101 is an equidigital number, since it uses as much as digits as its factorization.

21020211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68470050.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21020211101 its reverse (10111202012), we get a palindrome (31131413113).

The spelling of 21020211101 in words is "twenty-one billion, twenty million, two hundred eleven thousand, one hundred one".