1223021101 has 4 divisors (see below), whose sum is σ = 1223191900. Its totient is φ = 1222850304.

The previous prime is 1223021099. The next prime is 1223021131. The reversal of 1223021101 is 1011203221.

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 976562500 + 246458601 = 31250^2 + 15699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223021101 - 2¹ = 1223021099 is a prime.

It is a super-2 number, since 2×1223021101² = 2991561226982504402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223021131) 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, 74166 + ... + 89143.

It is an arithmetic number, because the mean of its divisors is an integer number (305797975).

Almost surely, 2^1223021101 is an apocalyptic number.

It is an amenable number.

1223021101 is a deficient number, since it is larger than the sum of its proper divisors (170799).

1223021101 is an equidigital number, since it uses as much as digits as its factorization.

1223021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170798.

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

The square root of 1223021101 is about 34971.7185880248. The cubic root of 1223021101 is about 1069.4110075455.

Adding to 1223021101 its reverse (1011203221), we get a palindrome (2234224322).

The spelling of 1223021101 in words is "one billion, two hundred twenty-three million, twenty-one thousand, one hundred one".