1201223221 has 4 divisors (see below), whose sum is σ = 1310425344. Its totient is φ = 1092021100.

The previous prime is 1201223209. The next prime is 1201223269. The reversal of 1201223221 is 1223221021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201223221 - 2¹⁷ = 1201092149 is a prime.

It is a super-2 number, since 2×1201223221² = 2885874453339229682, 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 = 1201223195 and 1201223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201223521) 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, 54601045 + ... + 54601066.

It is an arithmetic number, because the mean of its divisors is an integer number (327606336).

Almost surely, 2^1201223221 is an apocalyptic number.

1201223221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201223221 is a deficient number, since it is larger than the sum of its proper divisors (109202123).

1201223221 is a wasteful number, since it uses less digits than its factorization.

1201223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109202122.

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

The square root of 1201223221 is about 34658.6673286784. The cubic root of 1201223221 is about 1063.0195205310.

Adding to 1201223221 its reverse (1223221021), we get a palindrome (2424444242).

It can be divided in two parts, 1201 and 223221, that added together give a palindrome (224422).

The spelling of 1201223221 in words is "one billion, two hundred one million, two hundred twenty-three thousand, two hundred twenty-one".