1220101221 has 16 divisors (see below), whose sum is σ = 1666589760. Its totient is φ = 793551360.

The previous prime is 1220101189. The next prime is 1220101241. The reversal of 1220101221 is 1221010221.

It is not a de Polignac number, because 1220101221 - 2⁵ = 1220101189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220101197 and 1220101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220101241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114751 + ... + 124931.

It is an arithmetic number, because the mean of its divisors is an integer number (104161860).

Almost surely, 2^1220101221 is an apocalyptic number.

It is an amenable number.

1220101221 is a deficient number, since it is larger than the sum of its proper divisors (446488539).

1220101221 is a wasteful number, since it uses less digits than its factorization.

1220101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11156.

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

The square root of 1220101221 is about 34929.9473374925. The cubic root of 1220101221 is about 1068.5592806015.

Adding to 1220101221 its reverse (1221010221), we get a palindrome (2441111442).

The spelling of 1220101221 in words is "one billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".