1223211021 has 16 divisors (see below), whose sum is σ = 1649793024. Its totient is φ = 806105664.

The previous prime is 1223210977. The next prime is 1223211023. The reversal of 1223211021 is 1201123221.

It is not a de Polignac number, because 1223211021 - 2⁹ = 1223210509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223211023) 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 15 ways as a sum of consecutive naturals, for example, 86196 + ... + 99378.

It is an arithmetic number, because the mean of its divisors is an integer number (103112064).

Almost surely, 2^1223211021 is an apocalyptic number.

It is an amenable number.

1223211021 is a deficient number, since it is larger than the sum of its proper divisors (426582003).

1223211021 is a wasteful number, since it uses less digits than its factorization.

1223211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13540.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1223211021 is about 34974.4338195774. The cubic root of 1223211021 is about 1069.4663601000.

Adding to 1223211021 its reverse (1201123221), we get a palindrome (2424334242).

The spelling of 1223211021 in words is "one billion, two hundred twenty-three million, two hundred eleven thousand, twenty-one".