1222001221 has 4 divisors (see below), whose sum is σ = 1396572832. Its totient is φ = 1047429612.

The previous prime is 1222001203. The next prime is 1222001233. The reversal of 1222001221 is 1221002221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221002221 = 7649 ⋅159629.

It is a cyclic number.

It is not a de Polignac number, because 1222001221 - 2⁵ = 1222001189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222001251) 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, 87285795 + ... + 87285808.

It is an arithmetic number, because the mean of its divisors is an integer number (349143208).

Almost surely, 2^1222001221 is an apocalyptic number.

It is an amenable number.

1222001221 is a deficient number, since it is larger than the sum of its proper divisors (174571611).

1222001221 is an equidigital number, since it uses as much as digits as its factorization.

1222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174571610.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1222001221 is about 34957.1340501478. The cubic root of 1222001221 is about 1069.1136634770.

Adding to 1222001221 its reverse (1221002221), we get a palindrome (2443003442).

The spelling of 1222001221 in words is "one billion, two hundred twenty-two million, one thousand, two hundred twenty-one".