210221213323021 has 16 divisors (see below), whose sum is σ = 214332410476800. Its totient is φ = 206149556727360.

The previous prime is 210221213323003. The next prime is 210221213323067. The reversal of 210221213323021 is 120323312122012.

It is a cyclic number.

It is not a de Polignac number, because 210221213323021 - 2²⁷ = 210221079105293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221213323001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11625451 + ... + 23571031.

It is an arithmetic number, because the mean of its divisors is an integer number (13395775654800).

Almost surely, 2^{210221213323021} is an apocalyptic number.

It is an amenable number.

210221213323021 is a deficient number, since it is larger than the sum of its proper divisors (4111197153779).

210221213323021 is a wasteful number, since it uses less digits than its factorization.

210221213323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11947236.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 210221213323021 its reverse (120323312122012), we get a palindrome (330544525445033).

The spelling of 210221213323021 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred thirteen million, three hundred twenty-three thousand, twenty-one".