211011001221 has 16 divisors (see below), whose sum is σ = 298273038848. Its totient is φ = 132456772800.

The previous prime is 211011001219. The next prime is 211011001231. The reversal of 211011001221 is 122100110112.

It is not a de Polignac number, because 211011001221 - 2¹ = 211011001219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211011001197 and 211011001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011001231) 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 15 ways as a sum of consecutive naturals, for example, 30657850 + ... + 30664731.

It is an arithmetic number, because the mean of its divisors is an integer number (18642064928).

Almost surely, 2^211011001221 is an apocalyptic number.

It is an amenable number.

211011001221 is a deficient number, since it is larger than the sum of its proper divisors (87262037627).

211011001221 is a wasteful number, since it uses less digits than its factorization.

211011001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61322652.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211011001221 its reverse (122100110112), we get a palindrome (333111111333).

The spelling of 211011001221 in words is "two hundred eleven billion, eleven million, one thousand, two hundred twenty-one".