1200211221 has 24 divisors (see below), whose sum is σ = 1815745792. Its totient is φ = 703929600.

The previous prime is 1200211211. The next prime is 1200211253. The reversal of 1200211221 is 1221120021.

It is not a de Polignac number, because 1200211221 - 2¹¹ = 1200209173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200211197 and 1200211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200211211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42076 + ... + 64581.

Almost surely, 2^1200211221 is an apocalyptic number.

1200211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200211221 is a deficient number, since it is larger than the sum of its proper divisors (615534571).

1200211221 is a wasteful number, since it uses less digits than its factorization.

1200211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106713 (or 106702 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1200211221 is about 34644.0647297629. The cubic root of 1200211221 is about 1062.7209143597.

Adding to 1200211221 its reverse (1221120021), we get a palindrome (2421331242).

It can be divided in two parts, 120021 and 1221, that multiplied together give a palindrome (146545641).

The spelling of 1200211221 in words is "one billion, two hundred million, two hundred eleven thousand, two hundred twenty-one".