20210221110011 has 4 divisors (see below), whose sum is σ = 21399057645912. Its totient is φ = 19021384574112.

The previous prime is 20210221109987. The next prime is 20210221110041. The reversal of 20210221110011 is 11001112201202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210221110011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210221110041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594418267925 + ... + 594418267958.

It is an arithmetic number, because the mean of its divisors is an integer number (5349764411478).

Almost surely, 2^{20210221110011} is an apocalyptic number.

20210221110011 is a deficient number, since it is larger than the sum of its proper divisors (1188836535901).

20210221110011 is a wasteful number, since it uses less digits than its factorization.

20210221110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188836535900.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20210221110011 its reverse (11001112201202), we get a palindrome (31211333311213).

The spelling of 20210221110011 in words is "twenty trillion, two hundred ten billion, two hundred twenty-one million, one hundred ten thousand, eleven".