210212021101221 has 48 divisors (see below), whose sum is σ = 311812300800000. Its totient is φ = 136402935302304.

The previous prime is 210212021101217. The next prime is 210212021101237. The reversal of 210212021101221 is 122101120212012.

210212021101221 is a `hidden beast` number, since 21 + 0 + 212 + 0 + 211 + 0 + 1 + 221 = 666.

It is not a de Polignac number, because 210212021101221 - 2² = 210212021101217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210212021101194 and 210212021101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212021101261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170010780 + ... + 171242778.

It is an arithmetic number, because the mean of its divisors is an integer number (6496089600000).

Almost surely, 2^{210212021101221} is an apocalyptic number.

It is an amenable number.

210212021101221 is a deficient number, since it is larger than the sum of its proper divisors (101600279698779).

210212021101221 is a wasteful number, since it uses less digits than its factorization.

210212021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234278 (or 1234275 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210212021101221 its reverse (122101120212012), we get a palindrome (332313141313233).

The spelling of 210212021101221 in words is "two hundred ten trillion, two hundred twelve billion, twenty-one million, one hundred one thousand, two hundred twenty-one".