1211021323 has 4 divisors (see below), whose sum is σ = 1263674448. Its totient is φ = 1158368200.

The previous prime is 1211021311. The next prime is 1211021363. The reversal of 1211021323 is 3231201121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3231201121 = 27961 ⋅115561.

It is a cyclic number.

It is not a de Polignac number, because 1211021323 - 2¹³ = 1211013131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211021297 and 1211021306.

It is not an unprimeable number, because it can be changed into a prime (1211021303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26326528 + ... + 26326573.

It is an arithmetic number, because the mean of its divisors is an integer number (315918612).

Almost surely, 2^1211021323 is an apocalyptic number.

1211021323 is a deficient number, since it is larger than the sum of its proper divisors (52653125).

1211021323 is an equidigital number, since it uses as much as digits as its factorization.

1211021323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52653124.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1211021323 is about 34799.7316512642. The cubic root of 1211021323 is about 1065.9019662460.

Adding to 1211021323 its reverse (3231201121), we get a palindrome (4442222444).

It can be divided in two parts, 12110 and 21323, that added together give a palindrome (33433).

The spelling of 1211021323 in words is "one billion, two hundred eleven million, twenty-one thousand, three hundred twenty-three".