211202221222121 has 8 divisors (see below), whose sum is σ = 220385077033920. Its totient is φ = 202019377955472.

The previous prime is 211202221222103. The next prime is 211202221222129. The reversal of 211202221222121 is 121222122202112.

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 211202221222121 - 2²⁶ = 211202154113257 is a prime.

It is a super-2 number, since 2×211202221222121² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (211202221222129) 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, 51568646 + ... + 55513328.

It is an arithmetic number, because the mean of its divisors is an integer number (27548134629240).

Almost surely, 2^{211202221222121} is an apocalyptic number.

It is an amenable number.

211202221222121 is a deficient number, since it is larger than the sum of its proper divisors (9182855811799).

211202221222121 is a wasteful number, since it uses less digits than its factorization.

211202221222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272575.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 211202221222121 its reverse (121222122202112), we get a palindrome (332424343424233).

The spelling of 211202221222121 in words is "two hundred eleven trillion, two hundred two billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".