121221011012211 has 72 divisors (see below), whose sum is σ = 202625668037520. Its totient is φ = 69588872496000.

The previous prime is 121221011012207. The next prime is 121221011012221. The reversal of 121221011012211 is 112210110122121.

It is a happy number.

121221011012211 is a `hidden beast` number, since 1 + 212 + 210 + 110 + 122 + 11 = 666.

It is not a de Polignac number, because 121221011012211 - 2² = 121221011012207 is a prime.

It is a super-2 number, since 2×121221011012211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121221011012221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 123263101 + ... + 124242641.

It is an arithmetic number, because the mean of its divisors is an integer number (2814245389410).

Almost surely, 2^{121221011012211} is an apocalyptic number.

121221011012211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221011012211 is a deficient number, since it is larger than the sum of its proper divisors (81404657025309).

121221011012211 is a wasteful number, since it uses less digits than its factorization.

121221011012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985569 (or 985555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121221011012211 its reverse (112210110122121), we get a palindrome (233431121134332).

It can be divided in two parts, 1 and 21221011012211, that added together give a palindrome (21221011012212).

The spelling of 121221011012211 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, eleven million, twelve thousand, two hundred eleven".