211220021121 has 16 divisors (see below), whose sum is σ = 283497883200. Its totient is φ = 139878243648.

The previous prime is 211220020993. The next prime is 211220021197. The reversal of 211220021121 is 121120022112.

It is not a de Polignac number, because 211220021121 - 2⁷ = 211220020993 is a prime.

It is a super-2 number, since 2×211220021121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211220021121.

It is not an unprimeable number, because it can be changed into a prime (211220021521) 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, 1720575 + ... + 1839243.

It is an arithmetic number, because the mean of its divisors is an integer number (17718617700).

Almost surely, 2^211220021121 is an apocalyptic number.

It is an amenable number.

211220021121 is a deficient number, since it is larger than the sum of its proper divisors (72277862079).

211220021121 is a wasteful number, since it uses less digits than its factorization.

211220021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122608.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211220021121 its reverse (121120022112), we get a palindrome (332340043233).

Subtracting from 211220021121 its reverse (121120022112), we obtain a palindrome (90099999009).

The spelling of 211220021121 in words is "two hundred eleven billion, two hundred twenty million, twenty-one thousand, one hundred twenty-one".