1201022221 has 4 divisors (see below), whose sum is σ = 1372596832. Its totient is φ = 1029447612.

The previous prime is 1201022219. The next prime is 1201022233. The reversal of 1201022221 is 1222201021.

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 1201022221 - 2¹ = 1201022219 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 (1201022521) 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, 85787295 + ... + 85787308.

It is an arithmetic number, because the mean of its divisors is an integer number (343149208).

Almost surely, 2^1201022221 is an apocalyptic number.

It is an amenable number.

1201022221 is a deficient number, since it is larger than the sum of its proper divisors (171574611).

1201022221 is an equidigital number, since it uses as much as digits as its factorization.

1201022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171574610.

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

The square root of 1201022221 is about 34655.7674997972. The cubic root of 1201022221 is about 1062.9602257393.

Adding to 1201022221 its reverse (1222201021), we get a palindrome (2423223242).

The spelling of 1201022221 in words is "one billion, two hundred one million, twenty-two thousand, two hundred twenty-one".