21020202100011 has 4 divisors (see below), whose sum is σ = 28026936133352. Its totient is φ = 14013468066672.

The previous prime is 21020202100003. The next prime is 21020202100033. The reversal of 21020202100011 is 11000120202012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21020202100011 - 2³ = 21020202100003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020202100011.

It is not an unprimeable number, because it can be changed into a prime (21020202140011) 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, 3503367016666 + ... + 3503367016671.

It is an arithmetic number, because the mean of its divisors is an integer number (7006734033338).

Almost surely, 2^{21020202100011} is an apocalyptic number.

21020202100011 is a deficient number, since it is larger than the sum of its proper divisors (7006734033341).

21020202100011 is an equidigital number, since it uses as much as digits as its factorization.

21020202100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006734033340.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020202100011 its reverse (11000120202012), we get a palindrome (32020322302023).

The spelling of 21020202100011 in words is "twenty-one trillion, twenty billion, two hundred two million, one hundred thousand, eleven".