1101220221 has 16 divisors (see below), whose sum is σ = 1547481600. Its totient is φ = 694648368.

The previous prime is 1101220193. The next prime is 1101220247. The reversal of 1101220221 is 1220221011.

1101220221 = T₃₅₀₃ + T₃₅₀₄ + ... + T₃₆₇₃.

It is not a de Polignac number, because 1101220221 - 2⁶ = 1101220157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101220197 and 1101220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101220261) 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, 36310 + ... + 59336.

It is an arithmetic number, because the mean of its divisors is an integer number (96717600).

Almost surely, 2^1101220221 is an apocalyptic number.

It is an amenable number.

1101220221 is a deficient number, since it is larger than the sum of its proper divisors (446261379).

1101220221 is a wasteful number, since it uses less digits than its factorization.

1101220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23888.

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

The square root of 1101220221 is about 33184.6383286002. The cubic root of 1101220221 is about 1032.6616743665.

Adding to 1101220221 its reverse (1220221011), we get a palindrome (2321441232).

The spelling of 1101220221 in words is "one billion, one hundred one million, two hundred twenty thousand, two hundred twenty-one".