911000211221 has 2 divisors, whose sum is σ = 911000211222. Its totient is φ = 911000211220.

The previous prime is 911000211179. The next prime is 911000211263. The reversal of 911000211221 is 122112000119.

It is a balanced prime because it is at equal distance from previous prime (911000211179) and next prime (911000211263).

It can be written as a sum of positive squares in only one way, i.e., 800334208996 + 110666002225 = 894614^2 + 332665^2 .

It is an emirp because it is prime and its reverse (122112000119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 911000211221 - 2¹⁴ = 911000194837 is a prime.

It is a super-2 number, since 2×911000211221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 911000211193 and 911000211202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (911000271221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455500105610 + 455500105611.

It is an arithmetic number, because the mean of its divisors is an integer number (455500105611).

Almost surely, 2^911000211221 is an apocalyptic number.

It is an amenable number.

911000211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

911000211221 is an equidigital number, since it uses as much as digits as its factorization.

911000211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 911000211221 in words is "nine hundred eleven billion, two hundred eleven thousand, two hundred twenty-one".