210101221205 has 48 divisors (see below), whose sum is σ = 275438828160. Its totient is φ = 153752521728.

The previous prime is 210101221201. The next prime is 210101221207. The reversal of 210101221205 is 502122101012.

It is not a de Polignac number, because 210101221205 - 2² = 210101221201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101221201) 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, 8181776 + ... + 8207414.

It is an arithmetic number, because the mean of its divisors is an integer number (5738308920).

Almost surely, 2^210101221205 is an apocalyptic number.

It is an amenable number.

210101221205 is a deficient number, since it is larger than the sum of its proper divisors (65337606955).

210101221205 is a wasteful number, since it uses less digits than its factorization.

210101221205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25838 (or 25821 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 210101221205 its reverse (502122101012), we get a palindrome (712223322217).

The spelling of 210101221205 in words is "two hundred ten billion, one hundred one million, two hundred twenty-one thousand, two hundred five".