221210222212121 has 8 divisors (see below), whose sum is σ = 223612262527584. Its totient is φ = 218819593015200.

The previous prime is 221210222212117. The next prime is 221210222212163. The reversal of 221210222212121 is 121212222012122.

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 221210222212121 - 2² = 221210222212117 is a prime.

It is a super-2 number, since 2×221210222212121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210222212321) 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, 2852740655 + ... + 2852818196.

It is an arithmetic number, because the mean of its divisors is an integer number (27951532815948).

Almost surely, 2^{221210222212121} is an apocalyptic number.

It is an amenable number.

221210222212121 is a deficient number, since it is larger than the sum of its proper divisors (2402040315463).

221210222212121 is a wasteful number, since it uses less digits than its factorization.

221210222212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705559271.

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

Adding to 221210222212121 its reverse (121212222012122), we get a palindrome (342422444224243).

The spelling of 221210222212121 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".