211221211101121 has 16 divisors (see below), whose sum is σ = 227878464933504. Its totient is φ = 194622761337984.

The previous prime is 211221211101119. The next prime is 211221211101133. The reversal of 211221211101121 is 121101112122112.

It is a cyclic number.

It is not a de Polignac number, because 211221211101121 - 2¹ = 211221211101119 is a prime.

It is a super-2 number, since 2×211221211101121² (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 (211221211101161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10002501 + ... + 22858093.

It is an arithmetic number, because the mean of its divisors is an integer number (14242404058344).

Almost surely, 2^{211221211101121} is an apocalyptic number.

It is an amenable number.

211221211101121 is a deficient number, since it is larger than the sum of its proper divisors (16657253832383).

211221211101121 is a wasteful number, since it uses less digits than its factorization.

211221211101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12857880.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 211221211101121 its reverse (121101112122112), we get a palindrome (332322323223233).

The spelling of 211221211101121 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred one thousand, one hundred twenty-one".