211220001221121 has 6 divisors (see below), whose sum is σ = 305095557319410. Its totient is φ = 140813334147408.

The previous prime is 211220001221063. The next prime is 211220001221167. The reversal of 211220001221121 is 121122100022112.

211220001221121 is a `hidden beast` number, since 211 + 220 + 0 + 0 + 1 + 2 + 211 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 155150441283600 + 56069559937521 = 12455940^2 + 7487961^2 .

It is not a de Polignac number, because 211220001221121 - 2¹⁸ = 211220000958977 is a prime.

It is a super-2 number, since 2×211220001221121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220001221094 and 211220001221103.

It is not an unprimeable number, because it can be changed into a prime (211220001221191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11734444512276 + ... + 11734444512293.

It is an arithmetic number, because the mean of its divisors is an integer number (50849259553235).

Almost surely, 2^{211220001221121} is an apocalyptic number.

It is an amenable number.

211220001221121 is a deficient number, since it is larger than the sum of its proper divisors (93875556098289).

211220001221121 is a wasteful number, since it uses less digits than its factorization.

211220001221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23468889024575 (or 23468889024572 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211220001221121 its reverse (121122100022112), we get a palindrome (332342101243233).

The spelling of 211220001221121 in words is "two hundred eleven trillion, two hundred twenty billion, one million, two hundred twenty-one thousand, one hundred twenty-one".