21210210010221 has 8 divisors (see below), whose sum is σ = 28759606793760. Its totient is φ = 13900476616752.

The previous prime is 21210210010207. The next prime is 21210210010261. The reversal of 21210210010221 is 12201001201212.

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

It is not a de Polignac number, because 21210210010221 - 2²⁹ = 21209673139309 is a prime.

It is a super-2 number, since 2×21210210010221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21210210010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210210010261) 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, 59915847310 + ... + 59915847663.

It is an arithmetic number, because the mean of its divisors is an integer number (3594950849220).

Almost surely, 2^{21210210010221} is an apocalyptic number.

It is an amenable number.

21210210010221 is a deficient number, since it is larger than the sum of its proper divisors (7549396783539).

21210210010221 is a wasteful number, since it uses less digits than its factorization.

21210210010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119831695035.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210210010221 its reverse (12201001201212), we get a palindrome (33411211211433).

The spelling of 21210210010221 in words is "twenty-one trillion, two hundred ten billion, two hundred ten million, ten thousand, two hundred twenty-one".