210020210000221 has 8 divisors (see below), whose sum is σ = 222415240289400. Its totient is φ = 197629724187648.

The previous prime is 210020210000207. The next prime is 210020210000243. The reversal of 210020210000221 is 122000012020012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 75265514824900 + 134754695175321 = 8675570^2 + 11608389^2 .

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 210020210000221 - 2⁹ = 210020209999709 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 (210020210000291) 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, 1136023996 + ... + 1136208853.

It is an arithmetic number, because the mean of its divisors is an integer number (27801905036175).

Almost surely, 2^{210020210000221} is an apocalyptic number.

It is an amenable number.

210020210000221 is a deficient number, since it is larger than the sum of its proper divisors (12395030289179).

210020210000221 is a wasteful number, since it uses less digits than its factorization.

210020210000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272238303.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210020210000221 its reverse (122000012020012), we get a palindrome (332020222020233).

The spelling of 210020210000221 in words is "two hundred ten trillion, twenty billion, two hundred ten million, two hundred twenty-one", and thus it is an aban number.