21020201011 has 4 divisors (see below), whose sum is σ = 22126527400. Its totient is φ = 19913874624.

The previous prime is 21020200961. The next prime is 21020201023. The reversal of 21020201011 is 11010202012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020201011 - 2³³ = 12430266419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020201311) 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, 553163166 + ... + 553163203.

It is an arithmetic number, because the mean of its divisors is an integer number (5531631850).

Almost surely, 2^21020201011 is an apocalyptic number.

21020201011 is a deficient number, since it is larger than the sum of its proper divisors (1106326389).

21020201011 is a wasteful number, since it uses less digits than its factorization.

21020201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106326388.

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

Adding to 21020201011 its reverse (11010202012), we get a palindrome (32030403023).

The spelling of 21020201011 in words is "twenty-one billion, twenty million, two hundred one thousand, eleven".