1223101021 has 4 divisors (see below), whose sum is σ = 1224185500. Its totient is φ = 1222016544.

The previous prime is 1223101007. The next prime is 1223101037. The reversal of 1223101021 is 1201013221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 384708996 + 838392025 = 19614^2 + 28955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223101021 is a prime.

It is a super-2 number, since 2×1223101021² = 2991952215142484882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223100992 and 1223101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223101051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540546 + ... + 542803.

It is an arithmetic number, because the mean of its divisors is an integer number (306046375).

Almost surely, 2^1223101021 is an apocalyptic number.

It is an amenable number.

1223101021 is a deficient number, since it is larger than the sum of its proper divisors (1084479).

1223101021 is a wasteful number, since it uses less digits than its factorization.

1223101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084478.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1223101021 is about 34972.8612069416. The cubic root of 1223101021 is about 1069.4343010837.

Adding to 1223101021 its reverse (1201013221), we get a palindrome (2424114242).

The spelling of 1223101021 in words is "one billion, two hundred twenty-three million, one hundred one thousand, twenty-one".