2111021221221 has 48 divisors (see below), whose sum is σ = 3346769986560. Its totient is φ = 1271610900000.

The previous prime is 2111021221201. The next prime is 2111021221259. The reversal of 2111021221221 is 1221221201112.

2111021221221 is a `hidden beast` number, since 211 + 1 + 0 + 212 + 21 + 221 = 666.

It is not a de Polignac number, because 2111021221221 - 2³⁰ = 2109947479397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111021221194 and 2111021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111021221201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15368596 + ... + 15505346.

It is an arithmetic number, because the mean of its divisors is an integer number (69724374720).

Almost surely, 2^{2111021221221} is an apocalyptic number.

It is an amenable number.

2111021221221 is a deficient number, since it is larger than the sum of its proper divisors (1235748765339).

2111021221221 is a wasteful number, since it uses less digits than its factorization.

2111021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137718 (or 137715 counting only the distinct ones).

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

Adding to 2111021221221 its reverse (1221221201112), we get a palindrome (3332242422333).

The spelling of 2111021221221 in words is "two trillion, one hundred eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".