1201111221 has 16 divisors (see below), whose sum is σ = 1686453120. Its totient is φ = 758894400.

The previous prime is 1201111141. The next prime is 1201111243. The reversal of 1201111221 is 1221111021.

It is not a de Polignac number, because 1201111221 - 2¹⁵ = 1201078453 is a prime.

It is a super-2 number, since 2×1201111221² = 2885336330424221682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201111197 and 1201111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201111271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72330 + ... + 87371.

It is an arithmetic number, because the mean of its divisors is an integer number (105403320).

Almost surely, 2^1201111221 is an apocalyptic number.

It is an amenable number.

1201111221 is a deficient number, since it is larger than the sum of its proper divisors (485341899).

1201111221 is a wasteful number, since it uses less digits than its factorization.

1201111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159836.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1201111221 is about 34657.0515335624. The cubic root of 1201111221 is about 1062.9864814631.

Adding to 1201111221 its reverse (1221111021), we get a palindrome (2422222242).

It can be divided in two parts, 12011 and 11221, that added together give a palindrome (23232).

The spelling of 1201111221 in words is "one billion, two hundred one million, one hundred eleven thousand, two hundred twenty-one".