21020212211113 has 4 divisors (see below), whose sum is σ = 21308160323668. Its totient is φ = 20732264098560.

The previous prime is 21020212211077. The next prime is 21020212211143. The reversal of 21020212211113 is 31111221202012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13468114631449 + 7552097579664 = 3669893^2 + 2748108^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020212211113 - 2²⁹ = 21019675340201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020212211143) 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, 143974056168 + ... + 143974056313.

It is an arithmetic number, because the mean of its divisors is an integer number (5327040080917).

Almost surely, 2^{21020212211113} is an apocalyptic number.

It is an amenable number.

21020212211113 is a deficient number, since it is larger than the sum of its proper divisors (287948112555).

21020212211113 is an equidigital number, since it uses as much as digits as its factorization.

21020212211113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287948112554.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21020212211113 its reverse (31111221202012), we get a palindrome (52131433413125).

It can be divided in two parts, 2102021 and 2211113, that added together give a palindrome (4313134).

The spelling of 21020212211113 in words is "twenty-one trillion, twenty billion, two hundred twelve million, two hundred eleven thousand, one hundred thirteen".