221121201221211 has 32 divisors (see below), whose sum is σ = 296238539520000. Its totient is φ = 146709763225088.

The previous prime is 221121201221159. The next prime is 221121201221233. The reversal of 221121201221211 is 112122102121122.

It is a cyclic number.

It is not a de Polignac number, because 221121201221211 - 2²⁵ = 221121167666779 is a prime.

It is a super-2 number, since 2×221121201221211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221121201229211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9896654506 + ... + 9896676848.

It is an arithmetic number, because the mean of its divisors is an integer number (9257454360000).

Almost surely, 2^{221121201221211} is an apocalyptic number.

221121201221211 is a deficient number, since it is larger than the sum of its proper divisors (75117338298789).

221121201221211 is a wasteful number, since it uses less digits than its factorization.

221121201221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30203.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221121201221211 its reverse (112122102121122), we get a palindrome (333243303342333).

The spelling of 221121201221211 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, two hundred eleven".