21020202021211 has 16 divisors (see below), whose sum is σ = 22511169100800. Its totient is φ = 19567987452000.

The previous prime is 21020202021193. The next prime is 21020202021223. The reversal of 21020202021211 is 11212020202012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020202021211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020202021241) 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 15 ways as a sum of consecutive naturals, for example, 1380715 + ... + 6629236.

It is an arithmetic number, because the mean of its divisors is an integer number (1406948068800).

Almost surely, 2^{21020202021211} is an apocalyptic number.

21020202021211 is a deficient number, since it is larger than the sum of its proper divisors (1490967079589).

21020202021211 is a wasteful number, since it uses less digits than its factorization.

21020202021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8012370.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020202021211 its reverse (11212020202012), we get a palindrome (32232222223223).

The spelling of 21020202021211 in words is "twenty-one trillion, twenty billion, two hundred two million, twenty-one thousand, two hundred eleven".