21021201110213 has 8 divisors (see below), whose sum is σ = 21214214887800. Its totient is φ = 20828190218688.

The previous prime is 21021201110191. The next prime is 21021201110233. The reversal of 21021201110213 is 31201110212012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 114158164129 + 20907042946084 = 337873^2 + 4572422^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21021201110213 - 2⁸ = 21021201109957 is a prime.

It is a super-2 number, since 2×21021201110213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021201110191 and 21021201110200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021201110233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15599843 + ... + 16893711.

It is an arithmetic number, because the mean of its divisors is an integer number (2651776860975).

Almost surely, 2^{21021201110213} is an apocalyptic number.

It is an amenable number.

21021201110213 is a deficient number, since it is larger than the sum of its proper divisors (193013777587).

21021201110213 is a wasteful number, since it uses less digits than its factorization.

21021201110213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443031.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21021201110213 its reverse (31201110212012), we get a palindrome (52222311322225).

The spelling of 21021201110213 in words is "twenty-one trillion, twenty-one billion, two hundred one million, one hundred ten thousand, two hundred thirteen".