1220223121 has 4 divisors (see below), whose sum is σ = 1314086452. Its totient is φ = 1126359792.

The previous prime is 1220223119. The next prime is 1220223139. The reversal of 1220223121 is 1213220221.

It is a happy number.

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 322561600 + 897661521 = 17960^2 + 29961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220223121 - 2¹ = 1220223119 is a prime.

It is a super-3 number, since 3×1220223121³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220223095 and 1220223104.

It is not an unprimeable number, because it can be changed into a prime (1220224121) 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, 46931646 + ... + 46931671.

It is an arithmetic number, because the mean of its divisors is an integer number (328521613).

Almost surely, 2^1220223121 is an apocalyptic number.

It is an amenable number.

1220223121 is a deficient number, since it is larger than the sum of its proper divisors (93863331).

1220223121 is an equidigital number, since it uses as much as digits as its factorization.

1220223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93863330.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220223121 is about 34931.6922149500. The cubic root of 1220223121 is about 1068.5948659110.

Adding to 1220223121 its reverse (1213220221), we get a palindrome (2433443342).

The spelling of 1220223121 in words is "one billion, two hundred twenty million, two hundred twenty-three thousand, one hundred twenty-one".