210101121222221 has 4 divisors (see below), whose sum is σ = 213662157175200. Its totient is φ = 206540085269244.

The previous prime is 210101121222217. The next prime is 210101121222229. The reversal of 210101121222221 is 122222121101012.

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 not a de Polignac number, because 210101121222221 - 2² = 210101121222217 is a prime.

It is a super-2 number, since 2×210101121222221² (a number of 29 digits) contains 22 as substring.

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 = 210101121222193 and 210101121222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101121222229) 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, 1780517976401 + ... + 1780517976518.

It is an arithmetic number, because the mean of its divisors is an integer number (53415539293800).

Almost surely, 2^{210101121222221} is an apocalyptic number.

It is an amenable number.

210101121222221 is a deficient number, since it is larger than the sum of its proper divisors (3561035952979).

210101121222221 is an equidigital number, since it uses as much as digits as its factorization.

210101121222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561035952978.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 210101121222221 its reverse (122222121101012), we get a palindrome (332323242323233).

The spelling of 210101121222221 in words is "two hundred ten trillion, one hundred one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".