210101022221 has 4 divisors (see below), whose sum is σ = 210102828192. Its totient is φ = 210099216252.

The previous prime is 210101022193. The next prime is 210101022283. The reversal of 210101022221 is 122220101012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210101022221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210101022196 and 210101022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101022121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715505 + ... + 965478.

It is an arithmetic number, because the mean of its divisors is an integer number (52525707048).

Almost surely, 2^210101022221 is an apocalyptic number.

It is an amenable number.

210101022221 is a deficient number, since it is larger than the sum of its proper divisors (1805971).

210101022221 is a wasteful number, since it uses less digits than its factorization.

210101022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805970.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210101022221 its reverse (122220101012), we get a palindrome (332321123233).

The spelling of 210101022221 in words is "two hundred ten billion, one hundred one million, twenty-two thousand, two hundred twenty-one".