211220121121 has 8 divisors (see below), whose sum is σ = 220413662784. Its totient is φ = 202027417680.

The previous prime is 211220121109. The next prime is 211220121169. The reversal of 211220121121 is 121121022112.

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 211220121121 - 2⁵ = 211220121089 is a prime.

It is a super-2 number, since 2×211220121121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220121095 and 211220121104.

It is not an unprimeable number, because it can be changed into a prime (211220122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335586 + ... + 731476.

It is an arithmetic number, because the mean of its divisors is an integer number (27551707848).

Almost surely, 2^211220121121 is an apocalyptic number.

It is an amenable number.

211220121121 is a deficient number, since it is larger than the sum of its proper divisors (9193541663).

211220121121 is a wasteful number, since it uses less digits than its factorization.

211220121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419111.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211220121121 its reverse (121121022112), we get a palindrome (332341143233).

Subtracting from 211220121121 its reverse (121121022112), we obtain a palindrome (90099099009).

The spelling of 211220121121 in words is "two hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-one".